| 发明名称 |
Dual flowing device |
| 摘要 |
|
| 申请公布号 |
US2531258(A) |
申请公布日期 |
1950.11.21 |
| 申请号 |
US19460652048 |
申请日期 |
1946.03.05 |
| 申请人 |
B. F. WEEKLEY |
发明人 |
CRANFILL OTIS |
| 分类号 |
E21B37/10;E21B43/14 |
主分类号 |
E21B37/10 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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