1
Chemical additives used in oil and gas well drilling operations for the control of bacteria, corrosion, and scale
7
Equipment used in oil and gas well drilling operations, namely, water treatment, well stimulation, well treatment pumps and chemical application equipment in the nature of disinfection, corrosion inhibition, and friction reduction, namely, pumps for machines and machine parts in the nature of injection nozzles
11
Water treatment equipment, namely, cartridge filtration units; water treatment equipment, namely, chemical sterilization units; water treatment equipment, namely, reverse osmosis filtration units; water treatment equipment, namely, ultraviolet sterilization units; and equipment used in oil and gas well drilling operations, namely, water treatment, well stimulation, well treatment pumps and chemical application equipment in the nature of disinfection, corrosion inhibition, and friction reduction, namely, chlorine dioxide generators and ozone generators
37
Technical consultation in the field of the construction, installation, maintenance and repair in the field of oil, gas, and fossil fuel drilling; consultation in the field of oil, gas, and fossil fuel drilling; oil and gas well improvement services, namely, hydraulic fracturing of subsurface geologic formations using stabilized fluids to enhance oil and gas well production
40
Consultation in the field of oil, gas, and fossil fuel production; water and wastewater treatment services
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