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History of perpetual motion machines
The history of perpetual motion machines dates back to the Middle Ages. For millennia, it was not clear whether perpetual motion devices were possible or not, but the development of modern theories of thermodynamics has shown that they are impossible. Despite this, many attempts have been made to construct such machines, continuing into modern times. Modern designers and proponents often use other terms, such as "overunity", to describe their inventions.
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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