| 发明名称 |
Rock drilling machine |
| 摘要 |
|
| 申请公布号 |
US1837947(A) |
申请公布日期 |
1931.12.22 |
| 申请号 |
US19300440035 |
申请日期 |
1930.03.29 |
| 申请人 |
LORNE BUNN |
发明人 |
BUNN LORNE |
| 分类号 |
E21B1/34;E21B21/01 |
主分类号 |
E21B1/34 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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