| Centennial Photographic Co. Telephone - for "Art and industry" - Koenig's Telephone 1876? Albumen print 20 x 12 cm Free Library of Philadelphia Collection: Centennial Exhibition, Item No: c011530 LL/41296 Exhibit title: Koenig, Rudolph, Paris, Exhibit #148, Main Exhibition Building, Bldg. #1.
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