7 machine couplings; motorized pumps, namely, reciprocating pumps, wing pumps, rotary positive displacement pumps, side channel pumps, and centrifugal pumps; pumping systems composed of drive motors, pumps, base plates, couplings, gears and controls therefor; parts for the aforementioned pumps, namely pump cases, pump shafts, impellers, guide wheels, screw spindles, and bearings; machine parts, namely, stators; eccentric screw pumps, screw pumps and parts thereof, namely articulated shafts and joints; oil extraction pumps