薄煤层综采沿空留巷定向钻进抽采临近下煤层瓦斯的方法

Release time:2020-10-30 Hits:

Affilication of Author(s):矿业工程学院

Disigner of the Invention:宋启,张村,张小刚,白庆升

Type of Patent:国内

State of Patent:专利授权

Application Number:201410295227.3

Number of Inventors:5

Service Invention or Not:no

Application Date:2014-06-25

Authorization Date:2016-05-18

First Author:wangfangtian