OXYGEN, THERMAL CONDUCTIVITY, HYDROCARBON, NEAR INFRA-RED, PHOTOMETRIC, FLUE GAS ANALYZERS, OXYGEN DETECTORS; [ AIRCRAFT NAVIGATION INSTRUMENTS-NAMELY, VERTICAL SPEEDOMETERS, ANGLE INSTRUMENTATION, DIGITAL CONTROLLERS AND MINICOMPUTERS, RECORDERS, SENSORS AND COLOR SHADE SENSORS; TRANSPONDERS, RADIO AND RADAR TEST SETS AND INTERROGATOR TEST SETS; DENTAL CASTING MACHINES AND DENTAL LATHES FOR LABORATORY USE; AMPLIFIER INPUT UNITS, SEISMIC PROFILE FACSIMILE RECORDERS, MARINE SEISMIC PROFILER AND HIGH RESOLUTION AMPLIFIER; TRANSITS, LEVELS, ALIDADES, CURRENT METERS, TRIPODS, WEIGHTS AND MEASURES, TESTING INSTRUMENTS FOR PAPER, THEODOLITES, JOHNSON BOARDS, RETICLES, SCALES, ENCODERS, DISCS AND WIND INSTRUMENTS; ] VACUUM GAUGES; PRESSURE, VELOCITY AND FLOW MEASURING INSTRUMENTS-NAMELY, FLOWMETERS, MASS FLOW TRANSDUCERS, [ TRACK PLOTTERS, MONITORSCOPES, POSITION INDICATORS AND RECORDERS, INTERVALOMETERS AND TRANSMITTERS; ] AUTOMATIC LIQUID SCINTILLATION + GAMMA COUNTERS, THERMOLUMINESCENT DOSIMETERS, THERMOELECTRIC GENERATORS, FUEL CELLS OF THE TYPE WHICH RECEIVE A CONTINUOUS SUPPLY OF REACTANTS FOR PRODUCING ELECTRICAL ENERGY; BENDING STRESS MONITORS; [ MILD, HARDFACING AND STAINLESS STEEL ELECTRODES; ] TRAVELING WAVE ELECTRON TUBES; [ AIRBORNE RADAR SYSTEMS, ANTENNA AND FEED SYSTEMS, RADAR AUGMENTERS AND BACKSCATTER RANGES; MONO-PULSE RECEIVERS USED WITH GROUND-BASED TRACKING FOR SPACE EXPLORATION; RECEIVERS, HEADPHONES, SPEAKER SYSTEMS, CARTRIDGE DECKS, MICROPHONES, BURGLAR ALARM SYSTEMS AND TRANSCEIVERS; ] HIGH TEMPERATURE WIRE, CABLE AND TUBING FOR ELECTRICAL SYSTEMS