Scraping and covering attachment for grain-drills, disk harrows, and the like. |
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| 申请号 | US1912723805 | 申请日 | 1912-10-03 | 公开(公告)号 | US1051873A | 公开(公告)日 | 1913-02-04 |
| 申请人 | ERB JACOB E; | 发明人 | ERB JACOB E; | ||||
| 摘要 | |||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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