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POWER AND INTERFACE EQUIPMENT FOR TELECOMMUNICATIONS SYSTEMS- NAMELY POWER AND RINGING SUPPLIES FOR KEY SET TELEPHONE INSTALLATION, VOICE AND DATA COUPLERS, RECORDER COUPLERS, VOICE CONNECTORS, BATTERY CHARGERS ELIMINATORS; MEASURING SETS FOR MAKING MEASUREMENTS ON VOICE TRANSMISSION CIRCUITS; MICROWAVE STATION AND SUB-SYSTEM POWER SUPPLIES; CUSTOM-DESIGNED ELECTRICAL POWER SOURCES; MAGNETIC COMPONENTS; PRINTED CIRCUIT CARDS AND BOARDS;ELECTRONIC ASSEMBLIES-NAMELY, TERMINAL BLOCKS, BOARDS, STRIPS, CONVERTERS, INDUCTORS, AND TRANSFORMERS; INDUSTRIAL CONTROL EQUIPMENT -NAMELY, TEMPERATURE CONTROLLERS FOR INJECTION MOLDING MACHINES,CYCLE AND PROGRAM CONTROLLERS FOR STERILIZERS; CONTROL MODULES AND PANELS; AND COMPUTER RELATED EQUIPMENT-NAMELY, POWER SUB-SYSTEMS AND TRANSFORMERS