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OSCILLOSCOPES; ELECTRIC METERS; LOGIC ANALYZERS; FIRST FOURIER TRANSFORM ANALYZERS; SIGNAL GENERATORS; STUDIO MEASURING UNITS-NAMELY, WAVEFORM AND VECTORSCOPE MONITOR AND COMPUTER AIDED TV SYNTHESIZER; POWER SUPPLIES; CRT DISPLAY MONITORS; DIGITAL TESTERS FOR USE IN TESTING ELECTRIC VOLTAGE, CURRENT AND RESISTANCE; DIODE CURVE TRACERS AND TRANSISTOR CURVE TRACERS FOR USE BY MANUFACTURERS OF SEMI-CONDUCTOR DEVICES; ELECTRIC FREQUENCY COUNTERS; LOAD RESISTORS; AND PRINTED CIRCUIT BOARD TESTERS