Рычажный переключатель телефонного аппарата (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Рычажный переключатель телефонного аппарата" in Russian language version.

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cntd.ru

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  • US Patent № 215,837.H.L. Roosevelt. Improvement in Telephone Switches.Patented May 27, 1879..

telhistory.ru

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