Ironically, the people who paved the way for Westinghouse's AC system to become the dominant electrical system in the United States were former Edison employees. One of these, Nikola Tesla, was a Serbian electrical engineer who came to the United States to work with Edison in 1884. He left the Edison factory to develop his own inventions and is credited with inventing the polyphase induction motor, a device, which allowed for long-distance application of AC electrical power. The other invention was a rotary converter by Charles Bradley, another former Edison employee. The converter was patented in October 1888 and combined elements of the AC system with the DC system, making it possible to connect high-voltage transmission lines to the DC central station and distribution networks. Thanks to these inventions, plus the hard marketing work of Westinghouse, AC systems were America's primary electrical distributors by the 1920s. Edison learned in the mid-1880s that he could be on the losing end of court battles and
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