TELEPHONE No. 331 | |||||||
Bakelite wall telephone for use in CB & Automatic areas on PBX extensions, systems that require recall facilities and certain extension plans. This telephone has provision for one button in the case moulding. The pictures shows a standard Telephone No. 333, with no button.
Diagram for telephone circuit - N431. Diagram for Button labels - N620. History, Technical and General Information on 300 type telephones Development of the Bakelite Wall Telephone |
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Last revised: April 23, 2022FM |