AIRCRAFT PARTS-NAMELY, HYDRAULIC AND FUEL SYSTEM PUMPS, ELECTRO-HYDRAULIC METAL FORMING MACHINES, TURBO SUPERCHARGERS FOR ENGINES; GEAR PUMPS; HYDRAULIC APPARATUS-NAMELY, HYDRAULIC GEAR PUMPS, HYDRAULIC GEAR MOTORS, AND POWER PACKAGE CONTAINING OIL TANKS, GEAR PUMPS AND VALVES; POWER TRANSMISSION EQUIPMENT-NAMELY, GEARED MOTORS, GEAR COUPLINGS, AIR MOTORS AND GEARTYPE HOISTS; TEXTILE MACHINES AND DEVICES-NAMELY, AUTOMATIC WINDERS, MELT SPINNING MACHINES, HIGH SPEED REELERS, DRAW TWISTERS, SPINNING GEAR PUMPS; VACUUM EQUIPMENT-NAMELY, ROTARY VACUUM PUMPS, VACUUM DRYING UNITS, VACUUM FREEZE DRYING UNITS, VACUUM IMPREGNATION UNITS, VACUUM EVAPORATION UNITS, HIGH VACUUM EVACUATION SYSTEMS INCLUDING COMBINATIONS OF DIFFUSION PUMPS OR MECHANICAL BOOSTER PUMPS WITH BACKING PUMPS AND PARTS THEREOF; WATER JET PUMPS; PULLEYS, GEARS, DOUBLE VISES, METAL SAMPLE POLISHERS; AQUARIUM AIR PUMPS AND MECHANICAL LUBRICATORS

AC CIRCUIT DEMONSTRATION ATTACHMENT UNITS, INDUCTION COILS, AND ELECTRICAL METERS-NAMELY, VOLTMETERS, AMMETERS, HIGH FREQUENCY AMMETERS, VOLTAMMETERS, WATTMETERS, POWER FACTOR METERS, FREQUENCY METERS, SYNCHRONISM INDICATORS, MULTIPLIERS, RECORDING VOLTMETERS, RECORDING AMMETERS, RECORDING WATTMETERS, RECORDING POWER FACTOR METERS, SILVER VOLTAMMETERS, COPPER VOLTAMMETERS; ELECTRONIC EQUIPMENT FOR AIRCRAFT-NAMELY, AIR DATA COMPUTERS FOR RECORDING, PROCESSING AND SIGNALLING CHANGES IN ATMOSPHERIC CONDITIONS, AND ELECTRONIC TEMPERATURE AND PRESSURE CONTROLLERS; LUBRICATION APPARATUS-NAMELY, OIL SIGNAL INDICATORS; BALANCES-NAMELY, ANALYTICAL BALANCES, DIRECT READING BALANCES, AUTOMATIC BALANCES, MICROCHEMICAL BALANCES, TORSION BALANCES, LIMIT BALANCES, WIND TUNNEL BALANCES, MAGNETIC SUSCEPTIBILITY MEASURING APPARATUS, SPECIFIC GRAVITY BALANCES, MOISTURE BALANCES, AND WEIGHTS FOR BALANCES; CHROMATOGRAPHS -NAMELY, GAS CHROMATOGRAPHS AND GEL PERMEATION CHROMATOGRAPHS; DATA PROCESSING APPARATUS-NAMELY, ELECTRONIC CONTROL COMPUTERS, SCANNING CONTROLLERS AND PIN BOARD-TYPE PROGRAM TIMERS; DIFFERENTIAL THERMAL ANALYSIS APPARATUS-NAMELY, THERMOBALANCES AND MICRO CALORIMETERS; ELECTRIC THERMOSTATS; ELECTRICAL MEASURING INSTRUMENTS-NAMELY, CADMIUM STANDARD CELLS, STANDARD SHUNTS, STANDARD RESISTANCES; POTENTIOMETERS, BRIDGES, GALVANOMETERS, CIRCUIT TESTERS, RESISTANCE METERS FLUXMETERS, (X-Y RECORDER, PORTABLE OR TABLE TYPE RECORDERS); THERMOMETERS AND PYROMETERS; ELECTROCHEMICAL APPARATUS-NAMELY, HYDROGEN ION DETERMINATION APPARATUS, POLAROGRAPHIC ANALYZERS, ELECTRIC TITRATORS AND ELECTROLYTIC GRAVIMETRIC ANALYZERS; ELECTROMAGNETIC ANALYTICAL APPARATUS-NAMELY, X-RAY ANALYTICAL APPARATUS, X-RAY QUANTORECORDERS, ELECTRON MICROPROBE, X-RAY ANALYZERS, ELECTRON MICROSCOPES, AND ULTRASONIC GENERATORS; EDUCATIONAL SCIENTIFIC APPARATUS-NAMELY, TAPE MEASURES, VERNIER CALIPERS, SLIDING CALIPERS, MICROMETERS, MIRROR SCALES, SPHEROMETERS, OPTICAL LEVERS, PLANIMETERS, MEASURING CYLINDERS, PIPETTES,BURETTES, MEASURING FLASKS, GLASS MEASURES, TABLE BALANCES, SPRING BALANCES, HYDROMETERS, ALCOHOL METERS, JOLLY'S SPRING BALANCES, DUNOUY'S TENSIOMETERS, STROBOSCOPES, METRONOMES, DIAL TACHOMETERS, THERMOMETERS, THERMISTER THERMOMETERS, THERMOCOUPLES, OSCILLATORS, OSCILLOSCOPES, SYNCHROSCOPES, HAND AND ELECTRIC CENTRIFUGES, SCHEIBLER'S DESSICATORS, HOT WATER FUNNELS, HEMISPHERICAL WATER BATHS, SOIL SIEVE SETS, PLATINUM NEEDLES, MORTAR-AND-PESTLES, SUPPORT STANDS, RETORT STANDS, FUNNEL STANDS, BURETTE STANDS, PIPETTE STANDS, TRIPODS, TEST TUBE STANDS, CRUCIBLE TONGS, LAMPS, BUNSEN BURNERS, PROPANE GAS BLAST BURNERS, NUMATA'S GASOLINE BLAST BURNERS, ELECTRIC HEAT CONE HEATERS, MICROSCOPES, MICROSCOPE LAMPS, MICROPROJECTORS, UNIVERSAL OVERHEAD PROJECTORS, TELESCOPES, SPECTROSCOPES, MAGNIFYING GLASSES, PHOTOMICROGRAPHIC CAMERA UNITS, PROJECTOR SCREENS, STABILITY COMPARISON TESTERS, DYNAMICS CARTS, RECORDING TIMERS, GAS LUBRICATED MOVEMENT DEVICES, DRY CELL OPERATED GLIDING BODIES, FALL TUBES, GYROSCOPIC WHEELS, CENTRIFUGAL FORCE GENERATING DEVICES, WATT'S GOVERNORS PERCUSSION SETS, DEMONSTRATORS OF NEWTON'S LAWS OF MOTION, BOHNENBERGER'S GYROSCOPES, FREE FALL SIMULATION APPARATUS, PENDULUMS, FLEXURE OF BEAMS DEMONSTRATION APPARATUS, TORSIONAL RIGIDITY DEMONSTRATION APPARATUS, RIPPLE PROJECTORS FOR LIQUIDS, ADJUSTABLE PHASE WAVE GENERATORS, SHIVE'S WAVE MACHINES, HAYASHIDA'S WAVE MOTION DEMONSTRATORS, GAY-LUSSAC'S SPECIFIC GRAVITY BOTTLES, HARE'S SPECIFIC GRAVITY TUBES, PASCAL'S PRINCIPLE DEMONSTRATING APPARATUS, ARCHIMEDES' PRINCIPLE DEMONSTRATING APPARATUS, BUOYANCY EXPERIMENTAL DEMONSTRATION APPARATUS, EXPERIMENTAL KITS FOR HYDRAULICS AND WATER FLOW PRESSURE DEMONSTRATIONS, POHL'S STREAM LINE DEMONSTRATING APPARATUS WATER PUMP EXPERIMENT SETS, BOYLE'S AND TORRICELLI'S LAWS DEMONSTRATING APPARATUS, MAGDEBURG HEMISPHERES, MACLEOD GAUGES, EVACUATION PLATES, VACUUM MANOMETERS, GLASS BELL JARS, AIR PUMP SETS, WIND TUNNEL DEMONSTRATORS, CROOKE'S RADIOMETERS, DEWAR'S VESSELS, INGENHOUZ'S HEAT CONDUCTIVITY DEMONSTRATORS, LINEAR AND HEAT EXPANSION DEMONSTRATION APPARATUS, CALORIMETERS, SPECIFIC HEAT SPECIMENS AND DEMONSTRATING APPARATUS, DEMONSTRATION STEAM GENERATORS, SPECIFIC HEAT OF LIQUID DEMONSTRATION APPARATUS, VICTOR MAYER'S VAPOR DENSITY APPARATUS, CARBON ARC LAMPS, MATERIAL IDENTIFIER "MINELIGHTS", CADMIUM LAMPS, SODIUM LAMPS, MERCURY LAMPS, OPTICAL DISCS, LUXMETERS, OPTICAL BENCHES, LINE SPECTRUM LIGHT SOURCES, BILATERAL SLITS, OPTICAL EXPERIMENTAL SETS, LIGHT REFRACTION EXPERIMENTAL SETS, OPTICAL TROUGHS, CONVEX AND CONCAVE LENSES, HELIOSTATS, LENS DEMONSTRATION SETS, ACHROMATIC LENSES, PRISMS, NEWTON'S COLOR DISCS, LIGHT COLOR MIXING EXPERIMENTAL DEVICES, SPECTROMETERS, SPECTROSCOPES, NEWTON'S RING DEVICE BIPRISMS, DIFFRACTION GRATINGS, POLARIZATION DISCS, FLUORESCENT AND PHOSPHORESCENT SPECIMEN SETS, TUNING FORKS, ORGAN PIPES, SONOMETERS, STETHOSCOPES, ROTATING CUBICAL MIRRORS, QUINEKE'S INTERFERENCE TUBES, RESONANCE DEMONSTRATION APPARATUS, MELDE'S EXPERIMENTAL TUNING FORK DEVICES, KUNDT'S WAVELENGTH MEASUREMENT APPARATUS, SOUND EXPERIMENT KITS, MAGNETS, MAGNETIC COMPASSES, ELECTROMAGNETS, DECLINATION MAGNETOMETERS, OSCILLATION MAGNETOMETERS, FRICTION RODS AND PADS, ELECTROSCOPES, BIOT'S HEMISPHERES, ELLIPSOIDAL CONDUCTORS, ELECTROPHORUSES, WIMSHURST INFLUENCE MACHINES, VAN DE GRAAF ELECTROSTATIC GENERATORS, HAMILTON'S ELECTRIC WHIRL DEVICES, LEYDEN JARS, DISCHARGERS, ELECTROMAGETISM MEASURING INSTRUMENTS, HAND DYNAMOS, AC AND DC CURRENT COMPARISON APPARATUS UNITS, ROTATING MAGNETIC FIELD DEMONSTRATORS, TRANSFORMERS, LABORATORY VOLT BOXES, DU BOIS-REYMOND COILS, NON-POLARIZING CONDUCTORS, DEMONSTRATION UNIVERSAL METERS, TESLA'S HIGH FREQUENCY CURRENT DEMONSTRATION APPARATUS, TELEGRAPH DEMONSTRATION SETS, SELF-INDUCTION CURRENT DEMONSTRATORS, ELECTROMAGNETIC PHENOMENA DEMONSTRATION KITS, ELECTROMAGNETIC OSCILLOGRAPH DEMONSTRATORS, GS AND HOFMANN ELECTROLYSIS DEMONSTRATION APPARATUS, OHM'S LAW DEMONSTRATORS, ELECTRIC RESISTANCE DEMONSTRATORS, EDDY CURRENT DEMONSTRATORS, FLEMING'S LAW DEMONSTRATORS, SPECTRUM TUBES, CROSS VACUUM SCALES, VACUUM DISCHARGE TUBES, CROOKE'S TUBES, GEISSLER'S TUBES, E/M MEASURING APPARATUS, X-RAY DEMONSTRATION APPARATUS, LAUE SPOT PHOTOGRAPHING APPARATUS, PHOTOTUBES, PHOTOELECTRIC DEMONSTRATION SETS, WILSON'S CLOUD CHAMBERS, DIFFUSION-TYPE CLOUD CHAMBERS, RADIATION CONDUCTORS AND METERS, ELECTRIC RESONANCE EXPERIMENTAL SETS, RADIO WAVE EXPERIMENTAL APPARATUS, SEMI-CONDUCTOR SAMPLE SETS, THERMISTER DEMONSTRATORS, ELECTRONIC COOLING VESSELS, VACUUM TUBE DEMONSTRATORS, LIEBIG'S CONDENSORS, SOXHLET'S FAT EXTRACTORS, ASPIRATING BOTTLES AND FUNNELS, EUDIOMETERS, OZENIZERS, OSMOTIC PRESSURE DEMONSTRATORS, BECKMANN'S MOLECULAR WEIGHT DETERMINATION APPARATUS, COLORIMETERS, MITSCHERLICH POLARIMETERS, ABBE'S REFRACTOMETERS, PIPETTE WASHERS, TEST TUBE DRYERS, STEAM DRYING OVENS, HOT AIR JET DRIERS, INFRARED RAY DRIERS, THERMOSTATS, CRUCIBLE FURNACES, MAGNETIC STIRRERS, MOTOR STIRRERS, SEMI-MICROCHEMISTRY EXPERIMENT KITS, CHEMISTRY EXPERIMENT SETS, CHEMICAL ANALYSIS EXPERIMENT KITS, PAPER CHROMATOGRAPH UNITS, PENSKY AND MARTEN'S FLASH POINT TESTERS, ENGLER'S AND REDWOOD'S VISCOSIMETERS, MOISTURE BALANCES, ABBE'S CAMERAS FOR USE WITH MICROSCOPES, KYMOGRAPHS, SPIRAL METAL TEMPERATURE REGULATORS, KOCK'S STEAM STERILIZERS, LIGHT COMPOSITION DEMONSTRATORS, RESPIRATION EXPERIMENT SETS, GLOBES, AUTONOMY DEMONSTRATION DEVICES, GOTO'S AND WATANABE'S PLANETARIUMS, HELIOGRAPHS, EGAMI'S CONSTELLATION PROJECTORS, ANEMOMETERS AND ASSOCIATED ELECTRIC COUNTERS, ANEMOSCOPES, ANEMOSCOPE RECORDERS, RAIN GAUGES, VAPORATION GAUGES, BAROMETERS, BENT EARTH THERMOMETERS, WET AND DRY BULB THERMOMETERS, ASSMANN'S ASPIRATORY PSYCHROMETERS, WEATHER CHART BLACKBOARDS, CONTACT GONIMETERS, MOH'S HARDNESS SCALES, PORTABLE SEISMOGRAPHS, CLINOMETERS, FLAT PLANE SURVEYING INSTRUMENTS, TRANSITS, LEVELS, SURVEYING SCALES, LEVELING BOX RULES, STRIKE AND DIP PRACTICE BOARDS, PLANKTON NETS WITH HANDLES, MICROTOMES, AQUARIUM WATER TEMPERATURE REGULATORS, MOLECULAR AND ATOMIC STRUCTURE DEMONSTRATION MODEL KITS, MODELS OF EACH OF THE FOLLOWING: SMALL DYNAMO, INTERNAL COMBUSTION ENGINE, STEAM ENGINE, STEAM TURBINE, SINGLE PHASE INDUCTION MOTOR, DIESEL MOTOR, AUTOMOBILE CHASSIS, ROTARY ENGINE, TORQUE CONVERTER, DIFFERENTIAL GEAR, REDUCTION GEAR, MULTIPLE GEARS, WHITWORTH'S QUICK RETURN MECHANISM, CONICAL PULLEYS, POWER TRANSMISSION BELT, CAM DEVICES, CAM AND GEAR, APUR WHEEL, SPIRAL GEAR, SPIRAL GEAR AND WORM WHEEL AND A HELICAL GEAR WHEEL, METAL AND PERIODIC CHART OF ATOMS, RANGE FINDER KITS, RECORDING TIMERS, HAND STROBOSCOPES, STRAW BALANCES, INERTIAL BALANCES, CENTRIPETAL FORCE EXPERIMENT APPARATUS, COLLISION DEMONSTRATION APPARATUS, OPTICAL EXPERIMENT KITS, PARTICLE REFRACTION EXPERIMENT KITS, ILLUMINATION EXPERIMENT KITS, ELECTROSTATIC EXPERIMENT KITS, ELECTRIC POTENTIAL EXPERIMENT KITS, ELECTROMETER ADAPTORS, ELECTROMAGNETISM EXPERIMENT KITS, ELECTRON MASS TESTING INSTRUMENTS, AND ANSWER CHECKER MACHINES FOR USE WITH EDUCATIONAL TEACHING MACHINES; GROUND MAINTENANCE TESTING EQUIPMENT FOR AIRCRAFT-NAMELY, HYDRAULIC INSTRUMENT, FUEL SYSTEM, AIR CONDITIONING AND PRESSURIZATION SYSTEMS TESTING APPARATUS, AVIATION MEDICINE TESTING APPARATUS, AND AIRCRAFT ENGINE TESTING EQUIPMENT; COLOR AND COLOR FASTNESS TESTING APPARATUS-NAMELY, COLOR FADING TESTER UNITS, COLOR FASTNESS TESTER UNITS, WEATHER TESTER UNITS FOR DETERMINING FADING AND AGING OF MATERIALS UNDER SIMULATED WEATHER CONDITIONS, LAUNDER TESTERS FOR TESTING COLOR FASTNESS OF TEXTILES DURING WASHING, XENON TESTERS FOR TESTING COLOR FASTNESS UNDER SIMULATED SUNLIGHT; MATERIAL TESTING MACHINES-NAMELY, HARDNESS TESTERS, IMPACT TESTERS, FATIGUE TESTERS, CREEP TESTERS, ABRASION TESTERS, TENSILE STRENGTH TESTERS, EVENNESS TESTERS, VISCOSITY AND FLOW TESTERS, AGING TESTERS, VIBRATION TESTERS, DYNAMIC BALANCING TESTERS AND STRUCTURE TESTERS; MICROCHEMICAL ANALYSIS APPARATUS- NAMELY, UNIVERSAL MICRO ORGANIC ANALYZERS, MICRO CARBON AND HYDROGEN DETERMINATION APPARATUS, MICRO NITROGEN DETERMINATION APPARATUS, MICRO HALOGEN AND SULFUR DETERMINATION APPARATUS, MICRO OXYGEN DETERMINATION APPARATUS, MICRO AND SEMI-MICRO "KJELDAHL" NITROGEN DETERMINATIONS APPARATUS, MICRO ALKOXYL RADICAL DETERMINATION APPARATUS, CONSTANT TEMPERATURE MICRO SAMPLE DRIERS, AND MICRO MELTING POINT DETERMINATORS; NONDESTRUCTIVE INSPECTION APPARATUS- NAMELY, MAGNETIC PARTICLE INSPECTION MACHINES, EDDY CURRENT INSPECTION APPARATUS, FLUORESCENT PENETRANT INSPECTION MACHINES, X-RAY AND GAMMA RAY APPARATUS FOR INSPECTING WELDED JOINTS AND RADIOGRAPHIC VIEWING OF STRUCTURAL MATERIALS FOR DEFECTS, FOREIGN INCLUSIONS AND THE LIKE; BETATRONS, RADIOISOTOPE APPARATUS FOR INDUSTRIAL USE AND X-RAY TV APPARATUS; OPTICAL INSTRUMENTS-NAMELY, OPTICAL MICROSCOPES, FLUORESECENT MICROSCOPES, HIGHSPEED CAMERAS AND LASERS; OPTICAL MEASURING INSTRUMENTS-NAMELY, REFRACTOMETERS, POLARIMETERS, DENSITOMETERS, COLORIMETERS, INTERFEROMETERS, SCHLIEREN APPARATUS, HIGH SPEED AIR FLOW MEASURING UNITS AND PRECISION LENGTH MEASURING INSTRUMENTS; PROCESS ANALYSIS INSTRUMENTS-NAMELY, MAGNETIC, INFRARED, ELECTROCHEMICAL, THERMAL CONDUCTIVITY AND SOLUTION CONDUCTIVITY GAS ANALYZERS, PH MEASURING APPARATUS OXIDATION- REDUCTION POTENTIOMETERS, CONDUCTOMETERS AND DENSITOMETERS; PROCESS CONTROL INSTRUMENTS-NAMELY, MOVING COIL METERS, MECHANICAL DIRECT RECORDING METERS, ELECTRONIC METER DETECTORS (TEMPERATURE, PRESSURE, LEVEL FLOW) INDICATORS, RADIOISOTOPE THICKNESS, DENSITY AND LEVEL GAUGES, X-RAY THICKNESS GAUGES; TRANSMITTERS, RECORDING CONTROLLERS; RADIATION MEASURING INSTRUMENTS AND MONITORS-NAMELY, RADIATION DETECTORS, RADIATION MEASURING ELECTRONIC APPARATUS, SPECTROMETERS, LIQUID SCINTILLATION, COUNTERS, GM SURVEY METERS, SCINTILLATION SURVEY METERS AND IONIZATION CHAMBER SURVEY METERS; RADIOACTIVE MATERIAL HANDLING EQUIPMENT-NAMELY, PERISCOPES, GLOVED BOXES, REMOTE HANDLING TONGS, REMOTE HANDLING PIPETTES AND NUCLEAR SCATTERING CHAMBERS; SPECTROMETERS-NAMELY, ULTRAVIOLET AND VISIBLE SPECTROPHOTOMETERS, INFRARED SPECTROPHOTOMETERS, EMISSION SPECTROSCOPIC APPARATUS, QUANTORECORDERS, FLUROPHOTOMETERS, LIGHT SCATTERING PHOTOMETERS AND RECORDING SPECTROPOLARIMETERS; VACUUM GAUGES-NAMELY, VERTICAL VACUUM GAUGES, UPRIGHT MCLEOD VACUUM GAUGES, ROTARY MCLEOD VACUUM GAUGES, AND IONIZATION VACUUM GAUGES; VACUUM LEAK DETECTOR UNITS UTILIZING AN ION ANALYZER TUBE AND MAGNETIC FIELD; VISCOSIMETERS, SEDIMENTOGRAPHS FOR DETERMINING PARTICLE SIZE DISTRIBUTION OF POWDERS, POWDER PARTICLE SIZE DETERMINATORS UTILIZING A CONSTANT PRESSURE AIR PERMEATION METHOD, PERMEASIZERS FOR DETERMINING THE AVERAGE DIAMETER OF POWDER PARTICLES; SURFACE AND INTERFACIAL LIQUID TENSIOMETERS, UNIVERSAL RHEOMETERS FOR MEASURING DEFORMATION AND FLUIDITY OF MATERIALS; CALORIMETERS

MEDICAL EQUIPMENT-NAMELY, DIAGNOSTIC X-RAY MACHINES AND ASSOCIATED TELEVISION SYSTEMS AND CONTROL UNITS, REMOTE-CONTROLLED DIAGNOSTIC X-RAY TABLE, DIAGNOSTIC X-RAY MACHINES FOR DENTAL USE, PORTABLE DIAGNOSTIC X-RAY MACHINES, X-RAY SUPPORT STANDS AND CEILING MOUNTING DEVICES, PLANIGRAPHIC X-RAY MACHINES, IMAGE ORTHICON CAMERAS FOR FLUOROSCOPY, FLUOROSCOPIC X-RAY UNITS, X-RAY PULSE CONTROL MACHINES, CATHETERIZATION TABLES, POLYGRAPHS; THERAPEUTIC X-RAY MACHINES, THERAPEUTIC TABLES, AUTOMATIC FILM DEVELOPING UNITS, X-RAY TABLES, RECTIFIER TUBES, IMAGE AMPLIFIERS, RADIOISOTOPE MACHINES FOR THERAPY, BETATRON RADIOISOTOPE DIAGNOSTIC MACHINES, MULTI-CHANNEL RECORDING UNITS, MULTI-CHANNEL MONITORING UNITS, ELECTROENCEPHALOGRAPHS, CARDIAC SYNCHRONIZERS FOR RADIOGRAPHY, MINIELECTROCARDIOGRAPHS, BLOOD CELL COUNTERS, ANESTHETIC GAS MONITORS, LIQUID SCINTILLATION COUNTERS, AND SCINTILLATION SPECTROMETERS

ELECTRICAL DEVICES-NAMELY, SMALL SERIES MOTORS, SINGLE PHASE INDUCTION MOTORS AND SHUNTS, POTENTIAL AND CURRENT TRANSFORMERS FOR INSTRUMENTS AND OPERATION RECORDERS; INSULATING PLATFORMS, RHEOSTATS, PRIMARY AND SECONDARY COILS; ELECTRIC BELLS, BUZZERS, AUDIO AMPLIFIERS, POWER CELLS AND BATTERIES, ACDC POWER SOURCE UNITS, SELENIUM RECTIFIERS, TUNGER RECTIFIERS, MARKING MAGNETS; ELECTRICAL HEATING EQUIPMENT-NAMELY, ELECTRIC DRYING OVENS, SMALL ELECTRIC FURNACES; INDUSTRIAL FURNACES-NAMELY, LARGE ELECTRIC HEAT TREATMENT FURNACES, CATHODE RAY TUBE FURNACES, ATMOSPHERE CONTROLLED HEAT TREATMENT FURNACES, GAS CARBURIZING FURNACES, HIGH VACUUM FURNACES, HIGH FREQUENCY INDUCTION FURNACES AND HEAT TREATMENT GAS FURNACES; BLOW PIPES, GAS GENERATORS, ELECTRIC MUFFLE FURNACES