Daqing Kefeng Petroleum Technology Development Co., Ltd., established on May 24,2002,Business scope including petroleum machinery equipment, metal structure, the electric heat tracing system, built-in heating device, the electric heating tube, skin heating device, the variable-frequency electric heating device, automatic control equipment, electrical facilities, electrical equipment, environmental equipment, automatic cleaning equipment, recycling equipment, small machinery, water treatment equipment research and development, production, processing, maintenance and sales;Production and sales of transformers, frequency converters, dirty oil and sewage recovery devices, negative pressure environmental protection recovery devices;Sales of chemical products (excluding dangerous chemicals), building materials, thermal insulation materials, plastic products, environmental protection products, electrical equipment, petroleum mechanical equipment and accessories, wires and cables, valves, steel, instruments and meters, underground tools, rubber products, hardware products, office supplies;Electric heater, wire and cable maintenance;Sucker rod, tubing sales;Import and export business (except for the items prohibited by laws and administrative regulations, which can only be operated after obtaining a license for the restricted items);Motor, transformer maintenance;Road transport of general goods.