AMMETERS, VOLTMETERS, OHMMETERS, SIGNAL GENERATORS, CATHODE RAY TUBE TESTERS AND REJUVENATORS, OSCILLOSCOPES, TUBE TESTERS, CURVE TRACERS, CAPACITOR TESTERS, RESPONSE CURVE INDICATORS, TELEVISION COLOR SIGNAL GENERATORS, POWER SUPPLIES, SURGE PROTECTORS, RESISTORS AND CAPACITOR SUBSTITUTION BOXES, TELEVISION RECEIVER PATTERN GENERATOR AND SIGNAL SUBSTITUTION APPARATUS TRANSISTOR TESTERS AND FREQUENCY COUNTERS