TELEPHONE No. 31 | |||||||
![]() Used in connection with up to four other Telephone No. 31's and a Telephone No. 33 or 35 to make a 5 or 10 extension house system. The press button calls the main telephone only. Uses a Telephone No. 30 as the handset. 4 terminal. Details otherwise as for Telephone No. 29. Made obsolete in 1947. Circuit Diagram - N131. System wiring diagram - N133. Information on all House telephone systems
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Last revised: November 21, 2021FM |