| 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.
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| 申请公布号 |
US4126002(A) |
申请公布日期 |
1978.11.21 |
| 申请号 |
US19770765856 |
申请日期 |
1977.02.04 |
| 申请人 |
DOWTY MINING EQUIPMENT LIMITED |
发明人 |
WALKER, JOHN H.;SUTTON, JAMES A. |
| 分类号 |
E21D23/00;E21D23/03;(IPC1-7):E21D15/44 |
主分类号 |
E21D23/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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