1893 - Thomas Edison received two U.S. patents. The first was for a "Cut Out for Incandescent Electric Lamps" and another for a "Stop Device" (No. 491,992-3). Also No. 492,150 for "Process of Coating Conductors for Incandescent Lamps."
... In his last years he was quite blind.
Throughout his long professorial career, and in all his numerous publications he remained, in spite of occasional deviations on ...