Telephone

1667:  Robert Hooke invents the string telephone

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1876: Bell transmits the sentence: “Mr. Watson, come here! I want to see you!” using a liquid transmitter and an electromagnetic receiver.

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1877: Edison files for a patent on a carbon (graphite) transmitter. Patent No. 474,230 was granted on May 3, 1892, after a 15-year delay because of litigation.

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601108_10152623781105487_1956761120_n1912 PUBLIC TELEPHONE INSTRUCTIONS

1969 VIDEO PHONE INSTRUCTIONS

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