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nature 15, 180-184 (28 December 1876) | doi:10.1038/015180a0
An Account of Duplex Telegraphy
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THE introduction of the duplex system of working not only upon land-lines, but on sub-marine cables, is without doubt the most important advance recently made in electric telegraphy. Duplex telegraphy may be defined as the art of telegraphing in opposite directions simultaneously along one line wire.
