Telephone hook (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Telephone hook" in English language version.

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gutenberg.org

Cyclopedia of Telephony & Telegraphy. Chicago: American School of Correspondence. 1919. p. 132.

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patentimages.storage.googleapis.com

US Patent № 209,592. T.A.Watson. Automatic Switch or Cut-Out for Telephones. Patented Nov 5, 1878.
US Patent № 215,837. H.L. Roosevelt. Telephone Switch. Patented May 27, 1879.

telhistory.ru

Иванов Александр. "Приключения Томаса Ватсона". telhistory.ru. Музей Истории Телефона.
Иванов Александр. "Эдвин Холмс (Edwin Holmes)". telhistory.ru. Музей Истории Телефона.