9 PRINTED CIRCUIT BOARDS; TRANSFORMERS; LOUDSPEAKERS; COMMUNICATIONS ACCESSORIES, NAMELY, POWER SUPPLIES, STANDING WAVE RATIO METERS, LOUDSPEAKER ENCLOSURES AND AUTOMOTIVE VEHICLE ANTENNA MOUNTS; BATTERY TESTERS; BATTERY CHARGERS, RADIO RECEIVERS; AND ELECTRICAL TEST EQUIPMENT, NAMELY, POCKET-SIZED BATTERY-POWERED SIGNAL INJECTORS AND POCKET-SIZED CONTINUITY, VOLTAGE AND POLARITY TESTERS