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Taking Cave Rescue Telephones Forward

WHY? Single-wire field telephones remain the most reliable and straightforward comms tool for cave rescue in Wales. The 1988 version. Second-hand BT 4T" earpieces as mic/spkrDPDT toggle switch for PTT functionSTDT toggle switch for on/off9 volt PP3 batteryNo call tone facilityPCB potted but s

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Taking Cave Rescue Telephones Forward

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