On Aug. 13, 1889 William Gray of Hartford, Connecticut, received a patent for a coin-operated telephone. Soon he formed the Gray Telephone Pay Station Company…
On January 19, 1878, Thomas Edison patented speaking telegraph (or telephone) in Italy. Although Bell invented telephone first, Edison’s invention of the carbon-button transmitter proved…
On January 17, 1882, Leroy Firman received a patent for the telephone switchboard. Patent Information Publication number: US252576 A Patent Title: Multiple switch-board for…
On December 7, 1880, Alexander Graham Bell patented photophone, which allowed for the transmission of speech on a beam of light. Bell believed the photophone…
