Apparatus for screening frames by a continuous process using screening rolls |
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| 申请号 | US11039249 | 申请日 | 1949-08-15 | 公开(公告)号 | US2695444A | 公开(公告)日 | 1954-11-30 |
| 申请人 | DETROIT STEEL PRODUCTS CO; | 发明人 | JOHNSON DAVID G; JOSEPH MAYER; | ||||
| 摘要 | |||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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