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Moving parts
Components of a machine which are able to move relative to the others / From Wikipedia, the free encyclopedia
For other uses, see Moving parts (disambiguation).
Machines include both fixed and moving parts. The moving parts have controlled and constrained motions.[1][2]
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Moving parts are machine components excluding any moving fluids, such as fuel, coolant or hydraulic fluid.[citation needed] Moving parts also do not include any mechanical locks, switches, nuts and bolts, screw caps for bottles etc. A system with no moving parts is described as "solid state"[citation needed].