*U.S. Patent No. 235,199, 12/07/1880 (app. 08/28/1880, no model) APPARATUS FOR SIGNALING AND COMMUNICATING, CALLED "PHOTOPHONE." (class: 359/149; 250/214.1; 359/213; 359/226; 359/235; 359/236; 359/291; 455/550) Bell, Alexander G. (assignee: American Bell Telephone Company) [abstract] [DjVu477KB]

*U.S. Patent No. 235,496, 12/14/1880 (app. 09/25/1880, no model) PHOTOPHONE-TRANSMITTER. (class: 359/150; 359/170) Bell, Alexander G. and Tainter, Sumner [abstract] [DjVu91KB]

*U.S. Patent No. 241,909, 05/24/1881 (app. 03/24/1881, no model) PHOTOPHONIC RECEIVER. (class: 359/150; 250/214.1; 359/154; 359/212; 359/223; 359/291) Bell, Alexander G. and Tainter, Sumner [abstract] [DjVu205KB]