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By certification 
Bare Braided Copper Wire adopt international standard production strictly, product line with the International Electrotechnical Commission IEC and European CE standards, leading production technology. Levels of oxygen - free copper, copper - containing up to 99.97%, resistance rate of less than 0.017241, to the highest industry standards, quality assured. Can be widely applied to railway,meteorology, communications, electric power, petrochemical, military, computer room and the grounding of intelligentbuilding engineering, as the ground material, wire, equipotential connections.
http://www.sk-copperwire.com/
