Cangzhou Silver Valley technology Co., LTD,it was established in 2007,located in Lijiapu Industrial Zone,Cangzhou City,Hebei Province,with a registered capital of 120 million yuan and an annual output value of 220 million yuan. We have got CQM Certificate in 2007, API 5CT Certificate in 2016,API 5L Certificate in 2019.Our company specialized in the...