7 Control, operating and clamping elements of metal or plastic for devices, machines and apparatus being machine parts, namely, adjustable clamping levers for holding piece parts on machine tool tables and adjustable clamping levers being parts of industrial machinery for holding work pieces, tension levers in the nature of gear lever knobs, safety clamping levers for holding piece parts on machine tool tables and safety clamping levers being parts of industrial machinery, ratchet tensioner, steel clamping levers for holding piece parts on machine tool tables and steel clamping levers being parts of industrial machinery, gear lever knobs, clamping hubs for holding piece parts on machine tool tables and clamping hubs being parts of industrial machinery for holding work pieces, star grip knobs, palm grip knobs, three-grip knobs, knurled handles, torque handles, eccentric clamps, spiral clamps, wedge clamps, centring clamps, quick release clamps, pneumatic clamps, spring-loaded thrust pads, operating handles, handles, stirrup handles, tube handles, control and locking cranks, hand cranks, hand wheels, spoke hand wheels, disc hand wheels with fixed or folding handle, clamping, tensioning and shifting levers, palm grip knobs and star handles, knobs, machine parts, namely, crankshafts for industrial machinery; machine parts, namely, hand wheels with position display scales; machine parts, namely, analog, digital mechanical and electronic position displays; machine parts, namely, closures in the nature of metal clamps for precision clamping of work pieces; machine parts, namely, ventilating closures; machine parts, namely, quick-release levers knobs for machines; machine parts, namely, pneumatic clamps for precision clamping of work pieces; ball-bearings for use in machines, namely industrial machinery; machine parts, namely, telescopic slides; machine parts, namely, linear ball-bearings and roller guides; machine parts, namely, mounting hangers adapted for exhaust systems for internal combustion engines; machine parts, namely, shift levers