| 发明名称 |
Bleeder for drill stems |
| 摘要 |
|
| 申请公布号 |
US2011089(A) |
申请公布日期 |
1935.08.13 |
| 申请号 |
US19340725632 |
申请日期 |
1934.05.14 |
| 申请人 |
HUGHES TOOL COMPANY |
发明人 |
JR. FREDERICK C. SMITH, |
| 分类号 |
E21B21/10 |
主分类号 |
E21B21/10 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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