Centrifugal pumps; Submersible pumps; Packet pumps in the nature of centrifugal pumps constructed of hardened alloys and high performance thermoplastics; Multi-phase screw pumps; Surface horizontal pumping systems comprised of centrifugal pumps and electric motors mounted on skids; Electric submersible induction motors, not for land vehicles; Electric submersible permanent magnet motors, not for land vehicles; Variable frequency drives for pumping systems for use in oil and gas well productio...