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- Hejian City Yinhai drill Manufacturing Co., Ltd. to participate in the 18th Abu Dhabi International Conference on Oil and Gas / Xinhua News Agency reported
- Release time：2015-11-21
- Hejian Yinhai Rock bits Manufacture Co., Ltd
- Release time：2015-10-02
- Hejian yinhai bit manufacturing co., LTD. Purchase and sale contract
- Release time：2015-10-02

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