MINER’S POCKET TELEPHONE
(FOR BATTERY RINGING)
No. U 568
Miner’s Tapping Telephone, comprising No. U 35 Ader Type Receiver, which serves both as Receiver and Transmitter, with Flexible Cord fitted to Circular Mahogany Block with “Ringing” and “Speaking“ Push Buttons, and provided with Expanding Hooks for making rapid connection to the bare signalling wires in mines.
NOTE: It is not claimed that this Instrument is as efficient, as a Standard Telephone.
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