E21D 1/03

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
8905486 Underground miningJun 30, 10Dec 09, 14TECHNOLOGICAL RESOURCES PTY. LIMITED
8591151 Forming a shaft for an underground mineJun 15, 12Nov 26, 13TECHNOLOGICAL RESOURCES PTY. LIMITED
4274675 Shaft-sinking apparatus with milling head and central worm conveyorAug 23, 79Jun 23, 81PAURAT GMBH