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Perpetual
What assumption is made about the amount of energy input and output the perpetual motion devices?
What does perpetual motion have to do with energy? perpetual motion, the action of a device that, once set in motion, would continue in motion forever...
Perpetual calendar watch
What is a perpetual calendar on a watch? Sometimes referred to in French as the Quantieme Perpetuel, a perpetual calendar watch is a mechanical timepi...