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Wheel

A circular component capable of rotating, used for many purposes and having many forms of construction. see WATERWHEEL, BELT PULLEY, GEAR WHEEL, BRAKE WHEEL, MITRE WHEEL, FRICTION DRIVE, TRUCK WHEELS, CAP-CENTRING WHEELS, WORM, WORM WHEEL, PIT WHEEL, COMBINATION PULLEY, COG WHEEL, SPURWHEEL, COMPASS ARM WHEEL, CLASP ARM WHEEL etc.