| 发明名称 |
Drilling machine |
| 摘要 |
|
| 申请公布号 |
US1771036(A) |
申请公布日期 |
1930.07.22 |
| 申请号 |
US19200407773 |
申请日期 |
1920.09.02 |
| 申请人 |
GILMAN GEORGE H |
发明人 |
GILMAN GEORGE H. |
| 分类号 |
E21B6/00;E21B6/02 |
主分类号 |
E21B6/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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