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In 1892, Tesla delivered his famous lecture before the Institution of Electrical Engineers and the Royal Institution of Great Britain, in London, where he gave his original induction motor to Prof. Ayrton. In 1887 and 1888 Tesla had an experimental shop at 89 Liberty Street, New York, and there he invented the induction motor. He sold the invention to Westinghouse in July 1888 and spent a year in Pittsburgh instructing Westinghouse engineers. Patent No. 447,921, dated March 10, 1891.

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