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Definition of a machine - A machine is any combination of bodies so connected that their relative motions are constrained, and by means of which force and motion may be transmitted and modified, as a screw and its nut, or a lever arranged to turn about a fulcrum or a pulley about its pivot, etc, especially, a construction more or less complex, consisting of a combination of moving parts or simple mechanical elements, as wheels, levers, cams, etc.

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