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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Senders : the brain of the machine switching apparatus which register the dial impulses and control all the succeeding operations of the apparatus in completing the call." The New York Public Library Digital Collections. 1860 - 1920. https://qa-digitalcollections.nypl.org/items/510d47d9-b19c-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Senders : the brain of the machine switching apparatus which register the dial impulses and control all the succeeding operations of the apparatus in completing the call." New York Public Library Digital Collections. Accessed November 27, 2024. https://qa-digitalcollections.nypl.org/items/510d47d9-b19c-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). Senders : the brain of the machine switching apparatus which register the dial impulses and control all the succeeding operations of the apparatus in completing the call. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47d9-b19c-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47d9-b19c-a3d9-e040-e00a18064a99 | title=
(still image)
Senders : the brain of the machine switching apparatus which register the dial impulses and control all the succeeding operations of the apparatus in completing the call., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=November 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>