Baoji Petroleum Machinery Co., LtdBaoji Petroleum Machinery Co., Ltd. (hereinafter referred to as Baoshi machinery), formerly known as Baoji Petroleum machinery plant, was founded in 1937. In 2002, it was jointly funded …

Lanzhou Lanshi Group Co., LtdLanzhou Lanshi Group Co., Ltd. (hereinafter referred to as Lanshi group) is located in Lanzhou City, the capital city of Gansu Province. The former Lanshi general plant was founded in 1953. I…

Sanjack has decades of history in tubing thread processing with advanced production equipment, complete testing methods and high-qualified inspection team. To ensure the quality of tubing products, our company strictly f…