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PUMPABLE MINE VENTILATION STRUCTURE

14/174,984 | U.S. Patent Application

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Location ELECTRONIC
Filed Feb. 7, 2014
Examiner FREDERICK LYNDON LAGMAN
Class 405
Art Group 3672
Patent No. 9,022,689
Case Type Utility - 405/132000
Status Patented Case
Parent 61/854,223 Expired
Parent 61/846,698 Expired
Child 14/627,058 Patented
Last Updated: 5 years, 1 month ago
Date # Transaction