| 发明名称 |
Mining tool |
| 摘要 |
|
| 申请公布号 |
US2089245(A) |
申请公布日期 |
1937.08.10 |
| 申请号 |
US19360086096 |
申请日期 |
1936.06.19 |
| 申请人 |
JOHN BARRON |
发明人 |
BARRON JOHN |
| 分类号 |
E21B7/00 |
主分类号 |
E21B7/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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