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In 1888 Tesla designed the first practical system of generating and transmitting alternating current for electric power. The American rights to this epoch-making invention were bought by the American inventor George Westinghouse, who demonstrated the system for the first time at the World's Columbian Exposition in Chicago. Two years later Tesla's alternating-current motors were installed at the Niagara falls power project. Tesla made his first invention, then called a telephone repeater, or amplifier, but today would be called a loud speaker.

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15y ago

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