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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. "Petentionmeter." The New York Public Library Digital Collections. 1923. https://qa-digitalcollections.nypl.org/items/510d47e4-7bd6-a3d9-e040-e00a18064a99
George Arents Collection, The New York Public Library. "Petentionmeter." New York Public Library Digital Collections. Accessed December 2, 2024. https://qa-digitalcollections.nypl.org/items/510d47e4-7bd6-a3d9-e040-e00a18064a99
George Arents Collection, The New York Public Library. (1923). Petentionmeter. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47e4-7bd6-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47e4-7bd6-a3d9-e040-e00a18064a99 | title=
(still image)
Petentionmeter., (1923)|author=Digital Collections, The New York Public Library |accessdate=December 2, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>