| 发明名称 |
FLUID OPERATED UNDERCUTTER |
| 摘要 |
<p>An undercutter for undercutting the wall of a substantially parallel sided hole and comprising a substantially tubular body adapted to pass into said hole, means on the body for setting the length of said body contained in the hole and a fluid-operated cutting head on the body and adapted to be rotated within the hole so as to form an undercut portion therein.</p> |
| 申请公布号 |
CA1085376(A) |
申请公布日期 |
1980.09.09 |
| 申请号 |
CA19770281510 |
申请日期 |
1977.06.28 |
| 申请人 |
JOHN MACDONALD & COMPANY (PNEUMATIC TOOLS) LIMITED;ALLAN, DAVID T. |
发明人 |
ALLAN, DAVID T. |
| 分类号 |
E21B4/14;E21B4/16;E21B4/18;E21B4/20;E21B10/32;(IPC1-7):21C13/10 |
主分类号 |
E21B4/14 |
| 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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