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Scientific American, Vol. 42, No. 2 (1880) (1880)
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acti- The telephone shown in the lower central figure in the This telephone is one of many, each of which is connected cal value, it has now become an important factor in the aecompanying engraving scarcely needs description, its con- by a single wire with the central office, the interior of which… … © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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