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."
... also known as Gyrotwister, is a gyroscopic toy sold commercially as a wrist exerciser device. Once the gyroscope inside it is going fast enough, for example afte ...