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Scientific American, Vol. 70, No. 5 (1894) (1894)
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le conditions, perspective and sectional views of the latest and most pole piece, ¢, at one end, and the soft iron distance over a line eight or ten miles long, no battery being re- improved form of telephone, all of the parts of which piece, d, at the opposite end, the magnets being are shown… … © 1894 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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