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Image ID: 98295
Diagram showing progress of a call from a machine switching subscriber to another machine switching subscriber or to a m...
NYPL Digital Gallery provides free and open access to over 800,000 images digitized from primary sources and printed rarities in the vast collections of The New York Public Library, including drawings, illuminated manuscripts, historical maps, vintage posters, rare prints and photographs, illustrated books, printed ephemera, and more.