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."
... the Dick's Picks series are based on two-track mixes made at the time of the recording. There have been at least 28 DP releases as of April 2003. Then a series of videos ...