- Tianhe Oil Group Huifeng Petroleum Equipment Co.,Ltd
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Yan'an, Shaanxi, China
- Main products: Drill Collars, Spiral Drill Collars, ntegral Heavy Weight Drill Pipe, and several kinds of drilling tools, work-over tools, cementing tools, coring tools, fishing tools and fitting, Hydraulic Bucking Unit, Hydraulic Jar Tester and so on
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