Hughes typewriting telegraph instrument, unknown maker, 1860. Invented about 1855 by David E Hughes (1829/31-1900), US patent numbers, 14,917, 1856; 22,531, 1859 and 22,770, 1859; British patent ...
THIS volume will be most useful as a work of reference to designers of telegraph machinery. It will also be useful as a text-book in telegraph administrations. The book has been very carefully ...
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