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Image ID: 99555
"The grand daddy of them all," the audion invented by Lee de Forest in 1906, and, developed by engineering staffs, now k...
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.