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vintage Monophone Telephone 2 Piece with Crank and battery Automatic Elec Co | eBay
TM 11-457 Local-Battery Telephone Equipment, 1942 : United States. War Department : Free Download, Borrow, and Streaming : Internet Archive
question:should a magneto phone ring its own bells when cranked?
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Local battery telephone exchange equipment (Purley exchange) switchboard, 'floor pattern type c'. From an album of … | Telephone exchange, Old technology, Telephone
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How to filter out ringing current in a local battery telephone system? - Electrical Engineering Stack Exchange
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Field Telephone
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