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6
Common metals and their alloys; metal building materials; transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; ironmongery, small items of metal hardware; pipes and tubes of metal; safes; goods of common metal not included in other classes; ores.
metal hardware for drilling or casing a well, namely, casing centralizers, tubing centralizers, welded positive centralizers, rigid positive centralizers, welded-bow centralizers, close tolerance centralizers, non-welded centralizers and spiral tubing centralizers, centralizers for multiple tubing completions and centralizers for logging tools, casing scrapers, wall scrapers, wall wipers, cable wipers, wall scratchers, wire scratchers, stop rings, metal collars, metal stop collars, casings, couplings, expansion joints, casing collars, tubing collars, bows and bottom hole scrapers, production packers, permanent seal bore packers, retrievable seal bore packers, tension set retrievable packers, compression set retrievable packers, retrievable dual 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, open hole hydro-mechanical packers, swell packers, ball launchers, open hole and cemented hole ball activated frac sleeves, toe valves, dissolvable frac balls, aluminum and composite plugs, float shoes, float collars, casing wiper plugs, and stage cementing collars, all of the foregoing not being parts of machines
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7
Machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; incubators for eggs.
machines for drilling, completing, producing, and working oil and gas wells and parts therefor, namely, casing centralizers, tubing centralizers, welded positive centralizers, rigid positive centralizers, welded-bow centralizers, close tolerance centralizers, non-welded centralizers and spiral tubing centralizers, centralizers for multiple tubing completions and centralizers for logging tools, casing scrapers, wall scrapers, wall wipers, cable wipers, wall scratchers, wire scratchers, stop rings, metal collars, metal stop collars, casings, couplings, expansion joints, casing collars, tubing collars, bows and bottom hole scrapers, production packers, permanent seal bore packers, retrievable seal bore packers, tension set retrievable packers, compression set retrievable packers, retrievable dual 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, open hole hydro-mechanical packers, swell packers, ball launchers, open hole and cemented hole ball activated frac sleeves, toe valves, dissolvable frac balls, aluminum and composite plugs, float shoes, float collars, casing wiper plugs, and stage cementing collars
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37
Building construction; repair; installation services
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
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40
Treatment of materials
custom manufacturing of drilling equipment, including spray coating of pipes, tubing, tools, and other equipment using a thermal spraying process in the field of manufacturing of oil and gas drilling equipment and components and parts therefor; technical consulting related to the manufacturing of oil and gas drilling equipment and components and parts therefor
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42
Scientific and technological services and research and design relating thereto; industrial analysis and research services; design and development of computer hardware and software
engineering services in connection with the custom design, manufacture, and application of specialized downhole tools