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The telegraph : translated from the French (1895)
Ternant, A. L. (Alcide Ludovic), 1832-1884 · London ; New York : G. Routledge and Sons · leaf 61
ACOUSTIC TELEGRAPHY. 43 Fig. 14. — Telephone Exchange, New York.Telegraph
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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