In the 1870s, two inventors Elisha Gray and Alexander Graham Bell both independently designed devices that could transmit speech electrically (the telephone). Both men rushed their respective designs to the patent office within hours of each other, Alexander Graham Bell patented his telephone first.
Elisha Gray's Patent Caveat - Horizontal View
Horizontal View
Drawing from Elisha Gray's patent caveat filed on February 14, 1876. The drawing depicts Elisha Gray's invention of his telephone device.
The History of the Telephone
The History of the TelephoneAlexander Graham Bell - Biography
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