Propulsion clutches and oscillation elements sold wholesale to distributors and directly to Original Equipment Manufacturers in the machine manufacturing industry, namely, belt tensioners, suspension tensioners, chain and belt tensioners for slack compensation, and anti-vibration mountings, oscillating mountings and motorbases, for use as a component of machinery; Tension and pressure elements sold wholesale to distributors and directly to Original Equipment Manufacturers in the machine manufacturing industry, namely, chain tensioning devices, belt tensioning devices and self-adjusting motor-bases for friction belt drives, oscillating mounts for shaker screens, elastic rocker arms for shaker conveyors, universal joints for gyratory sifter suspensions, anti-vibration mounts, shock absorbers, and torque-elastic spring devices for the suspension of friction belt drives, for use as a component of machinery