Huajin Group Has Obtained 4 Patents | ||
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Recently, 4 utility model patents of China Coal Huajin Energy Group Limited has been authorized by the State Intellectual Property Office including “An Adaptive Dynamic Hole Sealing System” , “A Basic Miners' Safety Lamp Based on High Precision Personnel Positioning”, “A Coal Volume Scanning Device Installation Structure of the Scraper Conveyor” and “A Basic Safety Double Power Supply Double Circuit Lighting Control Device for Mine Flameproof”. | ||
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