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last 30 patents
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Patent Grant
Equipment system for no-roadway no-coal-pillar retained roadway min...
Patent number
11,008,860
Issue date
May 18, 2021
Manchao HE
Manchao He
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
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Patent Application
EQUIPMENT SYSTEM FOR NO-ROADWAY NO-COAL-PILLAR RETAINED ROADWAY MIN...
Publication number
20180187548
Publication date
Jul 5, 2018
Manchao HE
E21 - EARTH DRILLING MINING