| 发明名称 |
Coated paper |
| 摘要 |
|
| 申请公布号 |
US2292518(A) |
申请公布日期 |
1942.08.11 |
| 申请号 |
US19390261310 |
申请日期 |
1939.03.11 |
| 申请人 |
JOHN HELFRICH |
发明人 |
HELFRICH JOHN |
| 分类号 |
D21H19/10;D21H19/18 |
主分类号 |
D21H19/10 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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