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When did Nikola Tesla introduce a prototype of the modern alternating-current motor?
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Nikola Tesla introduced the prototype of the modern alternating-current (AC) motor in 1888.1
While Tesla had constructed his first induction motor in 1883 while working in Strassburg, it was in 1888 that he formally introduced the prototype of the present-day AC motor to the public and industry. That same year, George Westinghouse purchased the patent rights to Tesla's polyphase system, which included his AC motors, dynamos, and transformers.12