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 been designed and by use of these phones, GEC produced 18 extension schemes around them.
The schemes and phones are discussed in depth in the following documents:-
Taken from the GEC Telephones and Switchboards (Manual and Automatic) Catalogue No. 11 (Circa 1933)
Last revised: February 01, 2022