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HIGH-FREQUENCY EQUIPMENT FOR USE IN THE ANALYSIS, DISPLAY, MEASUREMENT, CONVERSION OR GENERATION OF HIGH-FREQUENCY TEST ELECTRICAL SIGNALS-NAMELY, BOLOMETER PREAMPLIFIERS, ATTENUATION CALIBRATORS, RF SUBSTITUTION ATTENUATORS, DOUBLE STUB TUNERS, AUDIO LEVEL INDICATORS, SQUARE WAVE MODULATORS, POWER SUPPLY MODULATORS, MODULATED RF SOURCES, DIFFERENTIAL NULL INDICATORS, PRECISION RF POWER BRIDGES, D.C. POWER SUPPLIES, THERMISTOR BRIDGES, STANDARD ATTENUATOR COMPARATORS, COAXIAL STEP ATTENUATORS, AND X-BAND POWER STANDARDS