一种梯级式大直径钻孔卸压增透抽采瓦斯的方法

Release time:2023-09-01 Hits:

School Sign:第一单位

Disigner of the Invention:李哲,张洋,胡世杰

Type of Patent:国内

State of Patent:专利授权

Application Number:202210078018.8

Service Invention or Not:no

Application Date:2022-01-24

Authorization Date:2022-10-18

First Author:wangfangtian