Construction machines and apparatus, namely, interference prevention devices for hydraulic excavators that restrict movement of an arm or boom of an excavator, safety devices that prevent the overturning of hydraulic excavators, boom length detection devices for truck cranes, load detection devices for truck cranes, angle detection devices for truck cranes, moment limiters for truck cranes, and multiplex transmission devices for truck cranes; vibration conveyors; linear motor type conveyors; semiconductor wafer transfer robots; semiconductor wafer transfer load ports; AC motors and DC motors, and structural parts therefor not including those for land vehicles; wind power electricity generators; reciprocating motors, namely, movable iron core linear actuators; small wind power electricity generators; vacuum chambers for manufacturing semiconductors; power-operated metalworking grinders; semiconductor wafer storing machines; semiconductor wafer positioning machines for use in manufacturing semiconductors; semiconductor substrate transferring machines; semiconductor manufacturing machines; electromagnetic clutches for machines, not for land vehicles; electromagnetic brakes for machines, not for land vehicles; starters for motors and engines; AC generators in the nature of alternators; DC generators; power transmissions and gearings for machines, not for land vehicles; brakes, not for land vehicles