Apparatus for grading or separating fibers according to their length |
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| 申请号 | US40744720 | 申请日 | 1920-09-01 | 公开(公告)号 | US1452353A | 公开(公告)日 | 1923-04-17 |
| 申请人 | LAWRENCE BALLS WILLIAM; FREDERICK HUTCHINS; | 发明人 | LAWRENCE BALLS WILLIAM; FREDERICK HUTCHINS; | ||||
| 摘要 | |||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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