Aeroplane engines; Aircraft engines; Engine mufflers; Engine or motor mufflers; Engines for air cushion vehicles; Engines for model vehicles; Engines not for land vehicles; Engraving machines; Fans for motors and engines; Gear boxes other than for land vehicles; Mechanical and pneumatic hoisting apparatus; Mechanical engine parts for land vehicles; Motor and engines except for land vehicles; Motors for model vehicles and/or slot cars; Motors other than for land vehicles; Mufflers for motors and engines; Pneumatic controls for machines, motors and engines; Conveying system equipment, namely, blowers; Electric motors, and their parts, not for land vehicles; Electric motors, not for land vehicles; Gear motors not for land vehicles; Hydraulic controls for machines, motors and engines; Power-operated blowers; Power-operated life-saving safety mechanism, namely, a controlled descent device comprised of several descent slowing mechanisms allowing for the regulated descent at a fixed and safe speed, a harness attached at either end of a steel fiber cable, and an assortment of accessories attached thereto