一种地面钻孔预裂爆破浅埋房式采空区顶板的方法

Release time:2023-09-29 Hits:

School Sign:第一单位

Disigner of the Invention:邵栋梁

Type of Patent:国内

State of Patent:专利授权

Application Number:202011022262.X

Service Invention or Not:no

Application Date:2020-09-25

Authorization Date:2023-05-02

First Author:wangfangtian