Marketing studies; marketing research; import-export agencies; auctioneering; sales promotion for others

Repair information; construction; underwater repair; boiler cleaning and repair; burner maintenance and repair; electric appliance installation and repair; machinery installation, maintenance and repair; rebuilding engines that have been worn or partially destroyed; rebuilding machines that have been worn or partially destroyed

Aerials; measuring apparatus; measuring instruments; materials for electricity mains (wires, cables); converters, electric; distribution consoles (electricity); voltage regulators; low-voltage power supply; electrolysers; ionization apparatus not for the treatment of air or water; electrobath

Ropes; car towing ropes

Technical research; technical project studies; engineering; quality control; analysis for oil-field exploitation; oil-well testing; geological surveys; oil-field surveys; oil prospecting; computer system analysis; creating and maintaining web sites for others

Nitrogen; nitric monoxide; nitrous oxide; dry ice (carbon dioxide); soda ash; salts for industrial purposes; oil dispersants; chemical additives for drilling muds; drilling muds; industrial chemicals; emulsifiers; antifoamer for water-resistant slurry; phosphor powder; chemical additives to fungicides

Boilers, other than parts of machines; heating apparatus for solid, liquid or gaseous fuels; fuel economizers; distillation apparatus; evaporators; steam boilers, other than parts of machines; oil burners; steam generating installations; flues for heating boilers; heat pumps

Trucks; trailers (vehicles); vehicles for locomotion by land, air, water or rail; concrete mixing vehicles; lifting cars (lift cars); tipping apparatus, parts of trucks and wagons; automobile bodies; propulsion mechanisms for land vehicles; fracturing trucks; truck-mounted blenders

Metal plating; boiler-making; recycling of waste and trash; waste treatment (transformation); destruction of waste and trash; incineration of waste and trash; sorting of waste and recyclable material (transformation); production of energy; rental of generators; processing and handling of chemical reagents