发明名称 MINE ROOF SUPPORT
摘要 A mine roof support comprising a floor-engaging member, one or more shielding members above the floor-engaging member, a flap pivotally mounted on the or on a shielding member and a sealing member pivotally mounted on the flap.
申请公布号 AU2169877(A) 申请公布日期 1978.08.03
申请号 AU19770021698 申请日期 1977.01.27
申请人 DOWTY MINING EQUIPMENT LTD. 发明人 JOHN HIRST WALKER;JAMES ANTHONY SUTTON
分类号 E21D23/00;E21D23/03 主分类号 E21D23/00
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