Beijing Hengdong Technology Co., Ltd v. Sichuan Huadelaisi Oil Equipment Inc. requesting to declare “A long-term wear-resisting drill collar ” utility

Post time:01-10 2018
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Beijing Hengdong Technology Co., Ltd v. Sichuan Huadelaisi Oil Equipment Inc. requesting to declare “A long-term wear-resisting drill collar ” utility model patent invalid

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