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How to make your own wireless set : A series of 25 (Godfrey Phillips Cigarettes)
George Arents Collection, The New York Public Library. "Inductance sliders and bars." The New York Public Library Digital Collections. 1923. https://digitalcollections.nypl.org/items/510d47e4-7bc9-a3d9-e040-e00a18064a99
George Arents Collection, The New York Public Library. "Inductance sliders and bars." New York Public Library Digital Collections. Accessed April 18, 2024. https://digitalcollections.nypl.org/items/510d47e4-7bc9-a3d9-e040-e00a18064a99
George Arents Collection, The New York Public Library. (1923). Inductance sliders and bars. Retrieved from https://digitalcollections.nypl.org/items/510d47e4-7bc9-a3d9-e040-e00a18064a99
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