| 发明名称 |
Drill tube |
| 摘要 |
|
| 申请公布号 |
US1761709(A) |
申请公布日期 |
1930.06.03 |
| 申请号 |
US19250076867 |
申请日期 |
1925.12.21 |
| 申请人 |
NATIONAL TUBE COMPANY |
发明人 |
DAVIES THOMAS D. |
| 分类号 |
E21B17/042;F16L15/00 |
主分类号 |
E21B17/042 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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