GEC Bakelite Office Push Button Telephone 20 Lines Pre 1950s England
G.E.C PRESS BUTTON INTERCOMMUNICATION TELEPHONE SYSTEM Circa 1940s G.E.C. Intercommunication Telephone System. [Calls are made by lifting the handset and pressing the appropriate button. Pressure on the button operates a buzzer at the called station, and the buzzer is heard as long as the pressure is maintained. Release of the finger pressure allows the button to fall into a locked position, where it remains until automatically restored by the replacement of the handset after the conversat