| 发明名称 |
Universal jack shaft |
| 摘要 |
|
| 申请公布号 |
US1990810(A) |
申请公布日期 |
1935.02.12 |
| 申请号 |
US19330702721 |
申请日期 |
1933.12.16 |
| 申请人 |
YOUNG WILLIAM T |
发明人 |
YOUNG WILLIAM T. |
| 分类号 |
E21B3/02 |
主分类号 |
E21B3/02 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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