7 Equipment used in oil or gas well production or drilling services;, namely, pumps, pump accessories, and pump components; motors, motor accessories, and motor components; electric motor frequency converters; power generators; sensors and gauges for use in oil or gas well production or drilling; devices for monitoring wellbore data, including pressure and temperature, and vibration; 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 comprising 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 production