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From Wikipedia; Microwave Oven

"Radarange, the first microwave oven in the world. It was almost 1.8 metres (5.9 ft) tall, weighed 340 kilograms (750 lb) and cost about 5000US dollars each. It consumed 3 kilowatts, about three times as much as today's microwave ovens, and was water-cooled. An early commercial model introduced in 1954 consumed 1.6 kilowatts and sold for US$2000 to US$3000. Raytheon licensed its technology to the Tappan Stove company in 1952. They tried to market a large, 220 volt, wall unit as a home microwave oven in 1955 for a price of US$1295, but it did not sell well. In 1965 Raytheon acquired Amana, which introduced the first popular home model, the countertop Radarange, in 1967 at a price of US$495."

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