Question

When did U.S. Patent Office issue patent for telephone Alexander Graham Bell?
a) 7 March 1876
b) 19 April 1848
c) 3 November 1872
d) 28 August 1862

Answer 1

March 7 1876

extra information

On March 7, 1876, Alexander Graham Bell received a patent for the telephone; three days later, he and associate Thomas Watson successfully tested their invention. Elisha Gray, Antonio Meucci and Thomas Edison all claimed to have invented the telephone first, and the issue is still a source of controversy.

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Answer 2

a) 7 March 1876......