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瓦斯抽采钻孔群区域性裂隙场二次注浆封堵装置及方法
- Release time:2020-10-30
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Affilication of Author(s):
安全工程学院Disigner of the Invention:
linboquanType of Patent:
国内State of Patent:
专利授权Application Number:
201210505101.5Number of Inventors:
2Service Invention or Not:
noApplication Date:
2012-12-03Authorization Date:
2015-10-21First Author:
LI Qingzhao
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