| 发明名称 |
Replaceable bit for percussion rock drill - has pilot bit and main bit with alternate cutting and chipping edges |
| 摘要 |
<p>Main bit (101) situated behind pilot bit (4) has radial edges (9,9') of alternately cutting and chipping type. The combined bit head is replaceable.</p> |
| 申请公布号 |
DE2841679(A1) |
申请公布日期 |
1980.04.10 |
| 申请号 |
DE19782841679 |
申请日期 |
1978.09.25 |
| 申请人 |
GUERGEN,KARL-HEINZ |
发明人 |
GUERGEN,KARL-HEINZ |
| 分类号 |
E21B10/40;E21B10/44;E21B10/58;(IPC1-7):21C13/06 |
主分类号 |
E21B10/40 |
| 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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