File:NIE 1905 Telephone - simple switchboard circuit.jpg
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NIE_1905_Telephone_-_simple_switchboard_circuit.jpg (772 × 320 pixels, file size: 73 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:32, 29 August 2017 | 772 × 320 (73 KB) | Bob Burkhardt | {{Information |Description ={{en|1=Diagram of simple metallic circuit switchboard: When a call is received the current coming in on the line wires causes the drop to fall, thus announcing the number of the subscriber. The central operator then inse... |
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