一种提高沿空留巷墙体接顶方法

Release time:2020-10-30 Hits:

Disigner of the Invention:宋子明,姜一鸣,周乔

Type of Patent:国内

State of Patent:专利授权

Application Number:201410179181.9

Number of Inventors:4

Service Invention or Not:no

Application Date:2014-04-29

Authorization Date:2017-04-26

First Author:Bao Yu