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."
... Passage of kidney stones through the urethra can be painful and subsequently it can lead to urethral strictures[?]
Endoscopy of the bladder via the urethra is called ...