TELEPHONE No. 331 | |||||||
Bakelite wall telephone for use in C.B. & Automatic exchange areas on PBX extensions, systems that require recall facilities and certain extension plans. This telephone had provision for one button in the case moulding. There was no call for this telephone so it was not released, the Telephone No. 321 being used instead. Diagram for telephone circuit - N431. Diagram for Button labels - N620. History, Technical and General Information on 300 type telephones 300 Type telephone circuit description Development of the Bakelite Wall Telephone |
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Last revised: February 19, 2023FM |