| 发明名称 |
ELONGATE MINE SUPPORT |
| 摘要 |
<p>A B S T A C T A elongate mine support comprising a timber pole with a metal sleeve reinforcement therearound has circumferential weaknesses in the sleeve for assisting controlled collapse of the sleeve when the support is under azial load.</p> |
| 申请公布号 |
CA1231843(A) |
申请公布日期 |
1988.01.26 |
| 申请号 |
CA19840465377 |
申请日期 |
1984.10.12 |
| 申请人 |
BESTOBELL SOUTH AFRICA LIMITED |
发明人 |
VENTER, DIRK C.S. |
| 分类号 |
E21D15/02;E21D15/14;(IPC1-7):E21D15/02 |
主分类号 |
E21D15/02 |
| 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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