| 发明名称 |
Rotary transmission head |
| 摘要 |
|
| 申请公布号 |
US2678192(A) |
申请公布日期 |
1954.05.11 |
| 申请号 |
US19510212452 |
申请日期 |
1951.02.23 |
| 申请人 |
LEDBETTER NUBERN P |
发明人 |
LEDBETTER NUBERN P. |
| 分类号 |
E21B3/04 |
主分类号 |
E21B3/04 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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