5 Utility Patents
#7,849 in Beijing
#27,264 in China
#828,843 in the World
Forward Citations = 0
Company Filing History:
China University of Mining and Technology
University of Science and Technology Beijing

4. 1 out of 2
China Railway Eleventh Bureau Group Co., Ltd
5. 1 out of 2
China Railway Eleventh Bureau Group Fourth Engineering Co., Ltd.
where one patent can have more than one assignee
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