发明名称 |
COLLAPSIBLE ELONGATE MINE SUPPORT |
摘要 |
<p>A mine support comprises a length of timber pole with wood removed to form longitudinally extending and tapering planar strips spaced circumferentially around it. The adjacent edges of the planar surfaces do not need to undercut the pole circumference, and a reinforcing sleeve is fitted over the pole against the pole surface around and between the planar surfaces.</p> |
申请公布号 |
CA1218534(A) |
申请公布日期 |
1987.03.03 |
申请号 |
CA19840457371 |
申请日期 |
1984.06.25 |
申请人 |
BESTOBELL SOUTH AFRICA LIMITED |
发明人 |
VENTER, DIRK C.S. |
分类号 |
E21D15/14;(IPC1-7):E21D15/50;E21D15/02 |
主分类号 |
E21D15/14 |
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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