一种交叉布置的U型对穿锚煤岩柱支护装置

Release time:2023-09-01 Hits:

School Sign:第一单位

Type of Patent:国内

State of Patent:专利授权

Application Number:202010389838.X

Service Invention or Not:no

Application Date:2020-05-11

Authorization Date:2021-03-16

First Author:yanghaifeng