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顺层瓦斯抽采钻孔分段封孔方法

Release time:2020-10-30 Hits:

Affilication of Author(s):安全工程学院
Disigner of the Invention:冯辉,chengyuanping,liwei,王伟,韦广建
Type of Patent:国内
State of Patent:专利授权
Application Number:201310343143.8
Number of Inventors:6
Service Invention or Not:no
Application Date:2013-08-08
Authorization Date:2016-01-20
First Author:wanghaifeng