NATIONAL TELEPHONE COMPANY
|Mining and Engine House Telephones
Pattern No. B375
Comprises - Granular Carbon Transmitter, Powerful Receiver and Listening Tube, Induction Coil and Connecting Terminals.
The whole of the parts are fitted in a cast iron waterproof case, provided with stuffing glands, through which the line wires pass to the interior.
This pattern is also suitable for use on ships.
Last revised: July 07, 2020