The operating microscope and the development of ear surgery.
D007758:Ear, Inner / Q000601:surgery; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008866:Microsurgery / Q000266:history*; D010040:Otosclerosis / Q000601:surgery*; D013200:Stapes Mobilization / Q000266:history; D013201:Stapes Surgery / Q000266:history; D006113:United Kingdom; D014481:United States