E21F 1/06

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
2017/0362,937 UNDERGROUND VENTILATION APPARATUS AND METHODJan 22, 16Dec 21, 17POLYVENT PTY LTD
2016/0061,033 METHOD AND APPARATUS FOR PROVIDING CONTROLLED ATMOSPHERE IN MOBILE MINE REFUGESAug 28, 15Mar 03, 16Not available