发明名称 |
Ring expander |
摘要 |
|
申请公布号 |
US2022737(A) |
申请公布日期 |
1935.12.03 |
申请号 |
US19340744661 |
申请日期 |
1934.09.19 |
申请人 |
RATHBUN LOUIS C |
发明人 |
RATHBUN LOUIS C. |
分类号 |
B21D39/20 |
主分类号 |
B21D39/20 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|
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