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It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd, who patented it in the U.S. on November 11, 1930 (U.S. patent 1,781,541). The three working fluids in this design are water, ammonia, and butane. [1] The Einstein refrigerator is a development of the original three-fluid patent by the Swedish inventors ...
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