NATIONAL TELEPHONE COMPANY
B615

BATTERY INTERCOMMUNICATION TELEPHONES

"REPLY-AND-CALL" SUB-STATION AUTOMATIC

WALL SET

Pattern No. B615

Comprises - Hand Combination Transmitter and Receiver with Double Contact Key, Cord, Automatic Replacement Cradle, Induction Coil, Buzzer and Push Button.

These Sub-Station Instruments are suitable for use with any ordinary pattern Battery Intercommunication Telephone as Central Station Instrument, but when so used the Sub-Stations cannot be switched through to one another.
 

Last revised: November 17, 2025