Mine-Ventilation Stoppings: with Especial Reference to Coal Mines in Illinois - Page 18a - UNT Digital Library
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Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. 5» .J-XJ ^ n n ???) f !*^T^ 1. is some question, vi^hen all is considered,
Super Stopping: A Permanent Solid Stopping for Directing Ventilation Airflows in Large-opening Metal/Nonmetal Mines
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Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. ing and emptying of the trap. In order to operate success-fully a return trap should be
How does bad ventilation spread Covid? Govt's principal scientific advisor explains | Latest News India - Hindustan Times
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