File:EB1911 Telegraph - Quadruplex Working.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:48, 23 February 2016 | 874 × 284 (36 KB) | Library Guy | {{Information |Description ={{en|1=Quadruplex telegraphy consists in the simultaneous transmission of two messages from each end of the line. The first to attain practical success was Edison, and his method with some modifications is still the one i... |
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