• Creator
  • Department of Commerce. Patent and Trademark Office. 1975-
  • Created Date
  • 1876-03-07
  • Description
  • Bell's telephone was the first apparatus to transmit human speech via machine. His work culminated in one of the most profitable and contested of all 19th-century patents.
  • Format
  • Patent drawings
    Paper
  • Rights
  • Unrestricted