Abstract
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.
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An Account of Duplex Telegraphy . Nature 15, 180–184 (1876). https://doi.org/10.1038/015180a0
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DOI: https://doi.org/10.1038/015180a0