Machines for drilling, completing, producing, and working oil and gas wells and parts therefor, namely, production packers, permanent seal bore packers, retrievable seal bore packers, tension set retrievable packers, compression set retrievable packers, retrievable dual packers, inflatable packers, tension unloaders, connector valves, index valves, fluid control valves, on/off tools, safety joints, swivel joints, packer tubing accessories, tubing anchors, liner hangers, liner packers, liner accessories, sliding sleeves, locks and nipples, blast joints, squeeze packers, inflatable packers, cement sleeves, cement retainers, squeeze manifolds, retrievable bridge plugs, drillable bridge plugs, selective treating assemblies, setting tools, retrieving tools, centralizers, open hole hydro-mechanical packers, inflatable packers, and swell packers, ball launchers, open hole and cemented hole ball activated frac sleeves, toe valves, dissolvable frac balls, and aluminum and composite plugs

Repair and maintenance of tools used in drilling, completion, production, and working of oil and gas wells; rental of tools used in drilling, completion, production, and working of oil and gas wells; contractor services, namely, review of and remedial recommendations for oil and as well downhole tools for others

Engineering services in connection with the design, manufacture, and application of specialized downhole tools