BELLSET No. 7 | ||||||||||||||||||||||||||||||||
Wall mounted switch unit for extension plans 5 & 7 on CBS No. 1 systems and
fitted close to the main telephone. For 1 exchange line and 1 extension with intercommunication (only during an exchange line transfer), with or without secrecy. Wooden construction with ringing generator, four position switch, indicator and magneto bell. Introduced in 1923. Diagram - N507. Bellset includes (1928):-
Bell set No. 7 interior
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Last revised: November 09, 2020FM |