| 发明名称 |
Drilling apparatus |
| 摘要 |
|
| 申请公布号 |
US2144687(A) |
申请公布日期 |
1939.01.24 |
| 申请号 |
US19370118947 |
申请日期 |
1937.01.04 |
| 申请人 |
PIPPIN JOHN W |
发明人 |
PIPPIN JOHN W. |
| 分类号 |
E21B10/66;E21B25/02 |
主分类号 |
E21B10/66 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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