7 Machine parts; control, operating and clamping elements of metal or plastic for devices, machines and apparatus (machine parts); parts of machines, namely operating handles, handles, bow-type handles, pipe handles, control and shut-off cranks, crank handles, hand wheels, spoked hand wheels, disc-type hand wheels with fixed or retractable handles, clamping and operating levers, palm grips and star handles, knobs, screws, nuts, headless pins and door bolts (machine parts); cranks (parts of machines); hand wheels with position display scales (machine parts); analog, digital, mechanical and electronic position displays (machine parts); closures (machine parts), included in this class; ventilating closures (machine parts)