GEC K7906
Wall pattern intercom telephone comprising if electro-magnetic handset, solid back transmitter with metal mouthpiece, automatic cradle switch, 25 ohm buzzer push button line selector and impedance coil.
Comes in 4 sizes:- 5 lines, 10 lines, 15 lines and 20 lines.
Cost in 1928 was £8.16.0 for the 20 line model.
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Last revised: 10 August, 2005
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