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TELEPHONE TRANSMISSION, PROTECTION, AND DISTRIBUTION EQUIPMENT-NAMELY, LOADING COILS, FRAMES, LOOP EXTENDERS, VOICE REPEATERS, RINGER ISOLATORS, ANNOUNCERS, TRUNK CIRCUITS, PRESSURE SWITCHES, AND COMPONENTS AND PARTS FOR SUCH EQUIPMENT

DATA RECORDERS-NAMELY, DIGITAL MAGNETIC TAPE DATA RECORDERS, AND COMPONENTS AND PARTS FOR SUCH EQUIPMENT