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Excerpt from Philipp Reis, Inventor of the Telephone: A Biographical Sketch, With Documentary Testimony, Translations of the Original Papers of the Inventor and Contemporary Publications
Medallion-portrait of the Inventor (from the Medallion executed by Rumpf in and Autograph. Vignette. Tomb of Philipp Reis, at Friedrichsdorf First Transmitter (the Wooden Ear)-back view front side section details Second Transmitter (tin Tube) Third Transmitter (collar-box) Fourth Transmitter (bored Block)
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