26 SYSTEMS, INSTRUMENTS, AND APPARATUS USED FOR ANALYSIS, SYNTHESIS, COUNTING, MEASURING, DATA ACQUISITION AND PROCESSING, DETECTION, INSPECTION, TESTING, DISPLAY, RECORDING, OR STANDARDS PURPOSES (FOR EXAMPLE, GAS CHROMATOGRAPHS, [ CHN ANALYZERS, OSMOMETERS, AUTOVISCOMETERS, MICROWAVE SPECTROMETERS, WAVEFORM ] DISTORTION ANALYZERS, SPECTRUM ANALYZERS, FREQUENCY SYNTHESIZERS, COUNTERS, AMMETERS, OHMMETERS, IMPEDANCE METERS, VOLTMETERS, POWER METERS, FREQUENCY METERS, SWR METERS, RATIO METERS, MICROWAVE NOISE FIGURE METERS, FREQUENCY MEASUREMENT INSTRUMENTATION, [ NUCLEAR MEASUREMENT INSTRUMENTATION ] QUARTZ THERMOMETERS, DATA ACQUISITION AND HANDLING SYSTEMS, CALCULATORS, COMPUTERS AND DATA PROCESSING SYSTEMS, [ ULTRASONIC TRANSLATOR DETECTORS, ] TEST EQUIPMENT FOR LOCATING FAULTS IN POWER ORTELEPHONE CABLES, SIGNAL SOURCES, MIXERS, MODULATORS, ATTENUATORS, COAXIAL AND WAVEGUIDE INSTRUMENTATION, OSCILLOSCOPES, PLOTTERS AND RECORDERS, AND FREQUENCY AND TIME STANDARDS) AND ACCESSORIES (FOR EXAMPLE, COLUMN MATERIALS AND BACKFLUSH VALVES FOR USE WITH CHROMATOGRAPHIC COLUMNS, CAMERAS FOR USE WITH OSCILLOSCOPES, AND CARTS FOR MOBILIZING TEST EQUIPMENT) USED WITH THESE SYSTEMS, INSTRUMENTS, AND APPARATUS