technology, telephone, first (useable) German telephone, was alternately held at ear or mouth, with attached call whistle, call ratchet sideways, signalized the come in call, whistle could be taken down from the receiver, first telephone of the Siemens and Halske Company, Berlin, Germany, 1878, Additional-Rights-Clearences-Not Available

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Photo credit: © INTERFOTO / History / Alamy / Afripics
License: Licensed
Model Released: No

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