BATTERY INTERCOMMUNICATION TELEPHONES
"REPLY-AND-CALL" SUB-STATION AUTOMATIC
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.