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David N. Crosthwait Jr. (May 27, 1898 – February 25, 1976) was an African-American mechanical and electrical engineer, inventor, and writer.Crosthwait's expertise was on air ventilation, central air conditioning, and heat transfer systems.
He invented the first AC motor in 1885. After him, the German engineer Friedrich August Haselwander develops the first AC 3 phase synchronous generator in Europe which produced about 2.8 kW at 960 rev/min, corresponding to a frequency of 32 cycles per second, today known as Hertz, or Hz.
In 2002, Walmart entered the Japanese market by acquiring a minor stake in Seiyu Group, who would become a wholly owned subsidiary of Walmart by 2008. In 2005, had $312.4 billion (~$468 billion in 2023) in sales, more than 6,200 facilities around the world, including 3,800 stores in the United States and 3,800 international units, and more than ...
Founded by Robert Kern in 1959, the company soon began producing portable generators for Sears, Roebuck and Co. under the Craftsman brand. During the 1970s, Generac expanded its offerings in the portable and recreational vehicle markets, and in the 1980s the company entered the commercial and industrial markets with its backup power generation systems.
The demonstration lighting system was driven by a hydroelectric generator that produced 500 volts AC, which was then stepped down to 100 volts to light incandescent bulbs in homes and businesses. That same year, Westinghouse founded the " Westinghouse Electric & Manufacturing Company "; [ 20 ] in 1889 he renamed it the "Westinghouse Electric ...
Home experts explain how to buy the best home generator, including cost, size, portable versus standby home generator, and more, to prepare for a power outage.
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Display of inductees in the National Inventors Hall of Fame in Alexandria. The National Inventors Hall of Fame is an American not-for-profit organization, founded in 1973, which recognizes individual engineers and inventors who hold a U.S. patent of significant technology.
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