[ Air purification and cooling, air deodorizing, boilermaking, treatment of water and liquid effluents, production of energy, blacksmithing, rental of electric power generators, metal treatment, recycling and incineration of refuse and waste; processing of oil and hydrocarbons, namely, generation of electricity, generation of power, incineration of waste, oil and gas well treatment, oil production services, rental of electric power generators, rental of power-generating equipment, rental of w...