GEC No's 200, 201
GEC TELEPHONE TELEPHONE SCHEMES
The GEC Extension Schemes are generally based on the Gecophone No. 75. Special phones that have switches and ringing devices have designed and by use of these phones, GEC designed 18 extension schemes around them.
The schemes and phones are discussed in depth in the following documents:-
GEC Current Comments Volume 8 - No.1 1938 and GEC Current Comments Volume 9 - No.2 1939.
Taken from the GEC Telephones and Switchboards (Manual and Automatic) Catalogue No. 11 (Circa 1936)
Last revised: August 05, 2012