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Patent Grant
Tunnel construction method using pre-support and post-support and a...
Patent number
10,358,920
Issue date
Jul 23, 2019
Dong-hyun Seo
E21 - EARTH DRILLING MINING
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last 30 patents
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Patent Application
TUNNEL CONSTRUCTION METHOD USING PRE-SUPPORT AND POST-SUPPORT AND A...
Publication number
20180252104
Publication date
Sep 6, 2018
HYUN ENGINEERING AND CONSTRUCTION CO., LTD
Dong-hyun SEO
E21 - EARTH DRILLING MINING