WissEl in Bangladesh

Explore 84 unique WissEl catalogue listings across Nanotechnology. Compare equipment and manufacturer references, then request a quotation for the model, accessories, delivery and support you need.

Plan your purchase: Mossbauer spectroscopy systems and components

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Isotope, sample form and experiment
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Products

MA-260S Mossbauer Velocity Transducer: The standard model in the WissEl velocity transducer line. It moves the gamma source during a Mossbauer measurement using NdFeB and SmCo5 magnets that leave practically no magnetic fringe field at the source position, so it suits all common Mossbauer experiments.
MVT-1000 Mossbauer Velocity Transducer: The top model in the WissEl velocity transducer line, built on a massive steel housing with NdFeB and SmCo5 high field magnets. The small moving mass allows operation over a wide velocity range, and the absence of fringe fields suits bidirectional sources.
MR-260 Mossbauer Drive Unit: A basic Mossbauer drive unit that forms a complete drive system with any WissEl velocity transducer. It accepts any waveform from a WissEl digital function generator and sets maximum velocity from a front panel ten turn potentiometer.
MR-260A Mossbauer Drive Unit: A Mossbauer drive unit with an error minimisation facility, so the velocity transducer can be run away from its resonance frequency across roughly 1 to 100 Hz. A logarithmic LED bar shows the deviation of the motion from its ideal value.
MR-360 Mossbauer Drive Unit: A Mossbauer drive unit with error minimisation and a three and a half digit display of maximum velocity. The display is calibrated against a Mossbauer calibration measurement using a front panel adjustment screw, and an LED bar shows the relative error.
MDU-1200 Mossbauer Drive Unit: The top drive unit in the WissEl range, with laser based calibration. Connected to the MVC-450 calibrator it displays the velocity and channel number for each channel, and an internal microcomputer performs the channel to velocity conversion.
MRG-500 Mossbauer Drive Unit: A Mossbauer drive unit with a built-in digital function generator, designed for the MA-260 and MVT-1000 transducers. It supplies sine and triangle reference waveforms and digital start and channel advance pulses to synchronise a multichannel analyser.
DFG-500 Digital Function Generator: The entry level digital function generator for a Mossbauer drive system. It stores the reference waveform digitally and converts it with a DAC, and provides start and channel advance pulses to synchronise a multichannel analyser.
DFG-1000 Digital Function Generator: A digital function generator that provides eight waveforms including constant velocity modes with sinusoidal slopes, which reduce vibration disturbance. Digital generation keeps the source motion synchronous with the channel sweep of the multichannel analyser.
DFG-1200 Digital Function Generator: The top digital function generator in the WissEl range. In addition to the standard waveforms it provides a region of interest waveform that can be varied continuously from constant velocity to constant acceleration, concentrating counting time on the lines of interest.
MVC-450 Mossbauer Velocity Calibrator: A laser interferometer calibrator that assigns a velocity value to each channel of a Mossbauer spectrum. It generates a pulse train whose frequency is proportional to the instantaneous velocity, and a NIM module powers the interferometer and digitises its output.
LND-45431 Proportional Counter: A gas filled proportional counter used as the transmission detector in a Mossbauer spectrometer. The beryllium entrance window and argon, krypton or xenon filling give good efficiency at the low gamma energies used in Mossbauer spectroscopy.
AMP-1000 Spectroscopy Main Amplifier: A single width NIM spectroscopy main amplifier for Mossbauer work. It accepts positive and negative preamplifier pulses, delivers bipolar output pulses, and can supply power to a preamplifier through a rear panel connector.
PEA-6 Preamplifier: A charge sensitive preamplifier for proportional counters used in Mossbauer spectroscopy. It accepts positive or negative charge pulses and delivers an inverted output pulse into 50 ohm for the main amplifier.
PEA-6A Preamplifier and Amplifier: A combined charge sensitive preamplifier and main amplifier in one compact housing, designed for proportional counters. The bipolar output connects directly to the analogue input of a CMCA-550 or CMCA-650 data acquisition module.
CMCA-550 Data Acquisition Module: A data acquisition module for Mossbauer spectroscopy that runs with a personal computer. It combines multichannel scaling for spectrum collection with pulse height analysis, so an energy window set in PHA mode can be applied while Mossbauer data is acquired.
HVS-2 High Voltage Power Supply: A compact single width NIM high voltage supply for radiation detectors, available in 3 kV and 6 kV versions. It is short circuit and overload protected, and warns by flashing LED and tone if the overvoltage limit or the NIM bin supply fails.
MBBC-HE0106 Mossbauer He/N2 Bath Cryostat: A top loading stainless steel bath cryostat for low temperature Mossbauer spectroscopy with the source at ambient temperature. It runs on liquid helium or liquid nitrogen and allows the sample to be changed while cold.
MBBC-N20106 Mossbauer N2 Bath Cryostat: A liquid nitrogen top loading bath cryostat for Mossbauer spectroscopy with the source at ambient temperature. The stainless steel body and low consumption give long stand times, and samples can be exchanged in cold condition.
TR-50 Temperature Controller: A temperature controller for the WissEl Mossbauer bath cryostats. It reads a DT-670 silicon diode inside the cryostat through a four wire connection and drives the cryostat heater from a built-in Eurotherm 3216 control module.
MBF-1100 Mossbauer Furnace: A furnace for Mossbauer effect measurements in vacuum or gas from room temperature upwards. A quartz tube holds the sample holder and inner heat screens, and two pipe connections allow evacuation, gas filling or a continuous gas flow without dismantling the furnace.
TR-55 Temperature Controller: A temperature controller designed for the MBF-1100 Mossbauer furnace, with an output stage sized to heat that furnace. It reads a type K thermocouple inside the furnace and has an auto-tune facility for the control loop.
RiKon-5 CEMS Detector: A three wire gas flow proportional backscatter detector for conversion electron Mossbauer spectroscopy. It examines thin films and near surface layers without high vacuum, and can also detect re-emitted x-rays to probe deeper regions of the sample.
MB-500 Mossbauer Bench: The basic Mossbauer bench, consisting of an optical track with sliders, clamps and mounting elements for the velocity transducer, absorber and detector. The rigid design suppresses vibration that would otherwise broaden the Mossbauer lines.
MB-500 VT Vertical Track: A vertical track that mounts on the MB-500 base track for Mossbauer experiments in vertical geometry. It is supplied with source screening for vertical geometry and a holder that carries the velocity transducer upright.
MB-600 Mossbauer Bench with Cryostat Stand: A Mossbauer bench that adds a cryostat stand to the optical track, so a bath cryostat, velocity transducer and detector can be aligned together. The sectional aluminium frame can be filled with sand or lead shot to add mass and damp vibration.
57Co Mossbauer Sources in Rh Matrix: Cobalt 57 Mossbauer sources in a rhodium matrix, supplied in several holder types. The cryogenic holder has a laser welded aluminium window for use from liquid helium temperature upwards, and a low absorption holder uses a Kapton window.
119mSn Mossbauer Sources in Ca-stannate Matrix: Tin 119m Mossbauer sources in a calcium stannate matrix for tin Mossbauer spectroscopy. The holder body is made from titanium alloy and the beryllium window is brazed in place to seal the source. Several standard activities are offered as stock items.
WAEMI-T1 Radiation Protection Safe: A lockable safe for storing Mossbauer sources. The steel housing carries fire protection insulation and a 30 mm lead shield, and the front door is lockable. Other dimensions or shielding thicknesses are available on request.
MA-260 Mossbauer Velocity Transducer: Mossbauer velocity transducer from WissEl's transducer line, listed on the company's instrument list and named in the minimum, economy and standard spectrometer configurations. WissEl's drive unit pages give it as one of the transducers the MRG-500 drive unit is designed to control. The manufacturer publishes no separate data sheet page for this model.
MBC-1L Mossbauer Bath Cryostat: Bath cryostat for Mossbauer measurements, carried on WissEl's instrument list. The manufacturer publishes no separate data sheet page for this model, so no dimensions or temperature figures are quoted for it.
MBF-1100TR Mossbauer Furnace with Temperature Controller TR-55: WissEl's instrument list gives MBF-1100TR as the MBF-1100 Mossbauer furnace supplied together with the TR-55 temperature controller. The furnace is built for Mossbauer effect measurements in vacuum or gas from room temperature upwards, around a quartz tube holding the sample holder and two inner heat screens, with kaolin cotton insulation and air cooling. Its construction allows the operating gas to be changed without taking the furnace apart or removing the sample, and the sample holder is made of steel with a high nickel content to resist aggressive gases at high temperature. The TR-55 adds a EUROTHERM 3216 control module with auto-tune, a pulse width controlled heater output and RS 232C remote control.
MDAS-1 Data Acquisition System with Combined Preamplifier and Main Amplifier: Complete counting and data acquisition chain for a Mossbauer spectrometer, built around a proportional counter and a combined preamplifier and main amplifier. The CMCA-550 module handles pulse height analysis and the MCS mode used to record Mossbauer spectra, and the set of cables to link the chain is included.
MDAS-2 Data Acquisition System with Separate Main Amplifier: Data acquisition system in which the preamplifier and the main amplifier are separate units, giving more freedom in setting up the pulse chain. It combines the LND-45431 proportional counter with the PEA-6 preamplifier and AMP-1000 spectroscopy amplifier, feeding the CMCA-550 acquisition module.
MDAS-3N Data Acquisition System with CEMS Detector: Version of WissEl's data acquisition system built around the RiKon-5 CEMS detector rather than a transmission proportional counter, so that conversion electron Mossbauer spectra can be recorded. The chain runs from the detector through the PEA-6A preamplifier and amplifier and the AMP-1000 main amplifier into the CMCA-550 acquisition module.
MDAS-3TT Data Acquisition System with CEMS Detector and Low Temperature Equipment: Low temperature CEMS acquisition system supplied with the RiKon-5TT detector assembly, which brings a polyethylene foam cryostat and a temperature controller with it. The vertical geometry needed for low temperature CEMS work is provided by the MB-500 VT vertical track included in the package. Signal processing runs through the PEA-6 preamplifier and AMP-1000 main amplifier into the CMCA-550 acquisition module.
RiKon-5-LNC Liquid Nitrogen Cryostat: Liquid nitrogen cryostat that surrounds the RiKon-5 CEMS detector with a nitrogen chamber walled in cellular material. If the detector is not heated the nitrogen charge lasts several hours, and a level sensor can be fitted for automatic refilling. Gamma radiation enters through a window in the bottom and reaches the detector after passing only a short distance of foam plastic, while gas and high voltage are fed in through openings in the top cover.
RiKon-5-LNC Controller 772 Temperature and Liquid Nitrogen Controller: Controller that governs the nitrogen level in the RiKon-5-LNC liquid nitrogen cryostat and manages the supply of liquid nitrogen to it. An AA118 germanium diode serves as level sensor and a PT100 thermo resistor inside the RiKon-5 CEMS detector as temperature sensor, giving a working span from close to liquid nitrogen temperature up to roughly room temperature. A built-in EUROTHERM 3216 module carries the temperature control functions, set from push buttons on the front panel or read and adjusted remotely over the RS 232C serial interface with optional software. Filling status is shown on a three colour LED and an adjusting screw sets the maximum permitted nitrogen transfer time before the alarm trips.
RiKon-5TT CEMS Detector with Polyethylene Foam Cryostat and Accessories: Low temperature CEMS detector assembly listed on WissEl's instrument list as the RiKon-5 detector together with a polyethylene foam cryostat and accessories. WissEl's MDAS-3TT entry adds that the RiKon-5TT package includes the foam cryostat and a temperature controller. It is the detector supplied with the MDAS-3TT low temperature data acquisition system.
MA-260SH High Velocity Mossbauer Velocity Transducer: The high velocity version of the MA-260S velocity transducer. It carries 1.5 mm multilayer guide springs in place of the standard 0.8 mm epoxy springs, which raises the resonance frequency and allows much higher source velocities with a high velocity drive unit.
MVT-1000H High Velocity Mossbauer Velocity Transducer: The high velocity version of the MVT-1000 velocity transducer, fitted with 1.5 mm multilayer guide springs. The stiffer springs keep the mechanical amplitude small, which is what allows source velocities above 1000 mm/s when driven by a high velocity drive unit.
MR-260AH High Velocity Mossbauer Drive Unit: The high velocity version of the MR-260A Mossbauer drive unit. It is built as a wider NIM module with four front panel potentiometers for the feedback loop and a rear panel fan that cools the power stage during high velocity operation.
MR-360H High Velocity Mossbauer Drive Unit: The high velocity version of the MR-360 Mossbauer drive unit, the model that adds a maximum velocity display. WissEl publishes it only in the list of high velocity drive units, with the shared features common to that range and no separate specification table.
MDU-1200H High Velocity Mossbauer Drive Unit: The high velocity version of the MDU-1200 Mossbauer drive unit, the model that supports laser calibration through the MVC-450. WissEl publishes it only in the list of high velocity drive units, with the shared features common to that range.
MB-AS-2-AP Absorber Holder for Quick Sample Exchange: Sliding absorber holder that lets the sample be changed within a few seconds. Moving the slider places either the absorber capsule or a lead shutter in the gamma beam, so that when the slider sits in the capsule removal position the radiation is blocked by the shutter. WissEl can also supply the unit without a shutter and with two absorber capsules instead.
MB-PAH-1 Acryl Capsule for the Mossbauer Absorber: Acrylic capsule that carries the Mossbauer absorber inside the absorber holder of the Mossbauer bench. It is a thin walled part dimensioned to fit the standard absorber holder of the MB-500 bench.
ADAPT-1 Adapter between Velocity Transducer and Interferometer: Mechanical adapter that couples a WissEl velocity transducer to an interferometer. It is listed among the optional components and accessories for the MB-500 Mossbauer bench.
MBF-MYWI-01 Aluminium Coated Mylar Window: Aluminium coated Mylar window supplied as a spare part for the MBF-1100 Mossbauer furnace. The MBF-1100 carries two windows on each side, the outer ones being made of Mylar foil.
APOLLO Dewar Vessel for Liquid Nitrogen: Dewar vessels of the APOLLO series are used for storing and transporting liquid nitrogen and suit the low temperature Mossbauer equipment WissEl offers. Vacuum super-insulation with long term vacuum protection keeps the evaporation rate low, and the vessels run on smooth rollers inside a transport protection frame. Fittings include a safety device at the vessel neck, a positive pressure relief and seal-off valve, a level indicator, a decanting head with waste gas and overflow valve, and integrated pressure build-up. APOLLO is a registered trademark of Cryotherm GmbH & Co. KG.
MBF-BND Boron Nitride Disk for Holding the Sample: Boron nitride disk that holds the powder sample inside the MBF-1100 Mossbauer furnace. It is listed among the spare parts for that furnace, where powder samples are placed between boron nitride plates inside the nickel rich steel sample housing.
Bubble Counter: Bubble counters are small glass containers filled with normal oil or silicon oil and fitted into the inlet and outlet pipes of the counting gas line. Gas passing through forms bubbles in the liquid, and counting those bubbles gives a measure of the gas flow. A typical flow produces a few bubbles per minute.
Dipstick for Measuring Helium Level: Dipstick used to read the liquid helium level, listed by WissEl among the accessories for its low temperature Mossbauer equipment. The manufacturer's page shows the dipstick but publishes no dimensions or other figures for it.
MB-DS-AP Enhanced Detector Shielding Option with 8 mm Lead Layer: Option that thickens the shield around the proportional counter on the MB-500 Mossbauer bench. The bench carries a 2.5 mm lead shield around the detector as standard, and the MB-DS-AP option raises that lead layer to 8 mm.
SLD-500A Enhanced Shielding Disk with up to 32 mm Lead Layer: Uprated shielding disk for the velocity transducer, offering a considerably heavier lead layer than the standard SLD-500 disk. WissEl publishes it as an enhanced shielding disk with a lead layer of up to 32 mm.
MB-EXT-01 Extension Tube, 50 mm: Extension tube fitted when the spacing between absorber and detector on the MB-500 bench has to be increased. Like the other shielding elements in the range it uses a sandwich construction with an 8 mm lead layer.
MB-EXT-02 Extension Tube, 80 mm: Longer version of the shielded extension tube for the MB-500 bench, used where a greater absorber to detector distance is required. Its sandwich shielding carries an 8 mm lead layer.
Gas Dehydration Unit: Glass bottle with a gas inlet and a gas outlet that the user fills with a drying agent. It is needed when the CEMS detector is operated at low temperature, where undried counting gas would otherwise lead to ice formation.
Gas Mixing Unit: Glass gas mixing unit with two valves for fine metering of the flow from two separate gas sources. It is used to blend the CEMS counting gas on site and is not required where a ready-for-use gas mixture is fed to the detector.
HELIOS Dewar Vessel for Liquid Helium: HELIOS series Dewar vessels store and transport liquid helium for the low temperature Mossbauer devices in WissEl's range. Vacuum super-insulation keeps evaporation low, and the vessel neck carries a vacuum seal with integral safety equipment, a port for a safety attachment and an overflow shut-off valve. Control can be set to manual or automatic, and the vessels run on smooth rollers. These vessels are licensed for indoor transport only; outdoor versions are made to order. HELIOS is a registered trademark of Cryotherm GmbH & Co. KG.
HETT-U1 Helium Transfer Tube: Helium transfer tube of type HETT-U1, used to move liquid helium from the storage Dewar into WissEl's low temperature Mossbauer equipment. Further rigid and flexible models are available alongside this type.
MB-H-RIKON Holder for RiKon-5 CEMS Detector on the Mossbauer Bench: Holder that mounts the RiKon-5 CEMS detector on the Mossbauer bench for room temperature work. In this arrangement the gamma beam runs horizontally, whereas a low temperature CEMS system uses a vertical geometry.
MBF-SH Holder for Sample or Heat Screen: Stainless steel holder used inside the MBF-1100 Mossbauer furnace to carry either the sample or a heat screen. It is built as an outer and an inner part, and is listed among the furnace's spare parts.
MBF-BN-0.1 Laser Perforated Boron Nitride Disk with 0.1 mm Holes: Boron nitride sample disk perforated by laser for in-situ measurements in the MBF-1100 furnace. Because the perforated disk lets gas pass through it, high temperature in-situ cells for Mossbauer spectroscopy can be built around it. This version carries 517 holes of 0.1 mm diameter.
MBF-BN-0.3 Laser Perforated Boron Nitride Disk with 0.3 mm Holes: Laser perforated boron nitride disk for in-situ Mossbauer measurements in the MBF-1100 furnace, supplied with the wider hole size. Gas permeability through the perforations allows high temperature in-situ cells to be assembled. The disk carries 517 holes of 0.3 mm diameter.
MA-MVT-NW-10 NW 10 Adapter for Velocity Transducer: NW 10 adapter that mounts on a WissEl velocity transducer, listed among the optional components and accessories for the MB-500 bench. WissEl's page shows the adapter both on its own and fitted to a transducer.
PCD-1 Perspex Cover Disk with Closable Opening: Perspex cover disk fitted with an opening that can be closed. With the opening shut the disk seals against an O-ring.
HSB 240-0,1-0,5 Pressure Regulator Valve for CEMS Counting Gas: Cylinder pressure regulator that WissEl specifies for setting the very weak counting gas flow required by the RiKon-5 CEMS detector. It screws onto the top of the counting gas cylinder and connects to the RiKon-5 through a flexible tube, which should be impermeable to water vapour where the detector is run at low temperature. The valve is made by Air Liquide.
PT 70 F Compact Vacuum Turbo Molecular Pump System: Turbomolecular pump system delivered fully assembled and ready to operate as a table top high vacuum unit. It runs entirely oil-free with air cooling, and control can be selected as manual or automatic, with operating parameters and pressure shown on the unit. WissEl highlights its high effective pumping speed, compact form and maintenance friendly design.
RiKon-5-AC Anode Wire Cassette: Cassette that makes replacing the anode wire of the RiKon-5 CEMS detector a job of a few minutes. It slots straight into the detector, so the sensitive anode wire never has to be touched and no adjustment work is needed. Delivery is in a sturdy plastic box with foam padding that doubles as storage.
S-7029 NIM Bin with Power Supply: NIM bin with an integral 180 watt power supply, used to house the NIM modules of a Mossbauer spectrometer. Line voltage is selected by internal wiring change across two ranges, and the supply carries current limiting of the fold back type together with overvoltage protection on the 6 V rail. A pilot lamp gives a temperature warning.
SA-1 Source Adapter: The SA-1 forms the link between a WissEl Mossbauer velocity transducer and the source holder attached to it. It matches the source mount of every WissEl transducer model, and its upper end carries an M4 thread so that all standard types of Mossbauer source can be screwed on.
SC-1 Set of Cables for Mossbauer Spectrometer: Cable set for interconnecting a WissEl Mossbauer spectrometer. It is listed as part of every spectrometer configuration on WissEl's instrument list, from the minimum configuration through to the advanced ones.
SC-2 Set of Cables for Data Acquisition Systems: Cable set supplied with WissEl's MDAS data acquisition systems. It appears in the parts list of the MDAS-1, MDAS-2, MDAS-3N and MDAS-3TT systems.
DISK-1 Sealing Disk between Velocity Transducer and Interferometer: Sealing disk fitted between the velocity transducer and the interferometer. It is offered alongside the ADAPT-1 adapter among the optional components for the MB-500 Mossbauer bench.
SLD-500 Shielding Disk for the Backside of the Velocity Transducer: Shielding disk mounted on the back face of the velocity transducer. It uses the sandwich construction WissEl applies across its shielding range, with an 8 mm thick lead layer.
SLD-501 Shielding Disk for the Frontside of the Velocity Transducer: Front face shielding disk for the velocity transducer, which stops the backwards directed radiation. A hole through the disk takes the source adapter with the source. Its sandwich shielding carries a lead layer 8 mm thick.
SLD-02 Shielding Disk for the Velocity Transducer: Shielding disk of sandwich construction for the velocity transducer, listed together with the SLD-500 as the pair covering the front and back faces. WissEl's accessories page for the MB-500 bench points to its Radiation Protection Devices section for the full survey of shielding components.
Shielding Materials: Lead Bricks, Lead Plates and Lead Granulate: Raw lead shielding materials for building source shields to an individual design. Lead bricks come in a range of forms, and lead plates are made in thicknesses from 0.5 mm up to 90 mm, usually 1000 mm by 1000 mm although other formats can be supplied. Lead granulate is used to fill stable metal or plastic boxes to form a shield, and can also be poured into the hollow parts of the Mossbauer benches to add weight and damp vibration.
MBF-SLD-500 Slider for Attaching the MBF-1100 Furnace to the MB-500 Bench: Aluminium slider that fixes the MBF-1100 Mossbauer furnace to the MB-500 Mossbauer bench. It is listed among the accessories to the furnace.
Source Depository: Insert for the lead source container, made of foamed plastic. It seats the Mossbauer source so that the source gripper can lift it out easily.
Source Gripper: Hand tool for lifting the Mossbauer source out of its lead container and screwing it onto the source adapter on the velocity transducer without touching the source. Three claws at the front end hold the source and an operating wheel at the rear works them, while a shield sits in front of the source once it is gripped. At roughly 380 mm the tool keeps the operator a safe distance from the source, and a shorter version is also made.
MB-AH-02 Source Shielding Version for Quick Sample Exchange: Alternative source shielding for the MB-500 bench, built for quick sample exchange. On this bench the source sits inside a cylinder made up of aluminium, brass and lead layers, a sandwich design that cuts scattered radiation compared with lead alone, and the lead layer is 8 mm thick. WissEl offers the source shielding in a standard version and in this quick exchange version.
Valve for Liquid Nitrogen: Valve mounted on top of a nitrogen Dewar and wired to the RiKon-5-LNC Controller 772. The controller opens and closes it so that the foam cryostat is refilled automatically.
WinNormos-for-Igor Software Package with WinSite and WinDist: WinNormos-for-Igor tackles almost all the common problems met in Mossbauer spectroscopy, bringing the old DOS Normos Site and Dist routines together in one package that runs inside the Igor graphing and analysis programme from WaveMetrics. All Mossbauer isotopes can be selected at run time, most of them predefined, and the static Hamiltonian is solved exactly for any isotope, with true transmission integral fits and automatic folding for triangular or sinusoidal velocity. WinSite treats a discrete set of subspectra while WinDist handles distributions in hyperfine field, quadrupole splitting or isomer shift, including correlation effects, Gaussian and Voigt distribution profiles and polarised source experiments with spin texture evaluation. Velocity calibration can be taken from WissEl laser drive files, workspaces are stored and recovered as Igor experiments with all numerical results, and reports can be generated automatically in Rich Text Format.

WissEl equipment: purchase questions

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What affects WissEl equipment pricing in Bangladesh?

Define the drive, detector, electronics, acquisition software and experimental accessories. Confirm source-related scope and responsibilities separately; do not assume a spectrometer package includes a source. Request a dated, itemised quotation stating currency, taxes, delivery, warranty and service responsibilities. A catalogue listing is not a current price or local-stock commitment.