E21D 1/10

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
2020/0208,517 UNDERGROUND VERTICAL SHAFTS AND NUCLEAR REACTORS USING THE SAMEDec 31, 18Jul 02, 20Not available
2020/0088,030 UNDERGROUND SHAFT DEVELOPMENT METHODMay 15, 18Mar 19, 20Not available