| 发明名称 |
Loose-leaf filing device |
| 摘要 |
|
| 申请公布号 |
US2372717(A) |
申请公布日期 |
1945.04.03 |
| 申请号 |
US19430509609 |
申请日期 |
1943.11.09 |
| 申请人 |
ROBERT FEDERN HANS |
发明人 |
FEDERN HANS ROBERT |
| 分类号 |
B42F13/02 |
主分类号 |
B42F13/02 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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