E21F 1/16

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9447685 Mine ventilation structure and a deck panel for such a structureApr 14, 15Sep 20, 16JACK KENNEDY METAL PRODUCTS & BUILDINGS, INC.
9394788 Mine ventilation structure and a deck panel for such a structureApr 14, 15Jul 19, 16JACK KENNEDY METAL PRODUCTS & BUILDINGS, INC.