煤矿井下人员安全警示装置

Release time:2020-10-30 Hits:

Disigner of the Invention:张申,赵正芳

Note:张申,赵正芳

Type of Patent:国际

State of Patent:专利撤回

Application Number:200820237524.2

Authorization number:CN 201314244Y

Number of Inventors:3

Service Invention or Not:no

Application Date:2008-12-16

Authorization Date:2009-09-23

First Author:丁恩杰