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ARRANGEMENT FOR LOCKING HOISTABLE VESSELS IN VENTILATION SHAFTS OF MINES
ARRANGEMENT FOR LOCKING HOISTABLE VESSELS IN VENTILATION SHAFTS OF MINES
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机译:锁定通风井中矿井的容器的布置
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摘要
device for locking operations of hoisting of trunks for ventilation shafts, включающееподъемный vessel, the вентил ционного barrel with the opening дл пропус a receptacle and вентил ционную dooron th
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