Method of cold forming tubular bodies having internal undercut grooves |
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| 申请号 | US70139657 | 申请日 | 1957-12-09 | 公开(公告)号 | US2917823A | 公开(公告)日 | 1959-12-22 |
| 申请人 | GEN MOTORS CORP; | 发明人 | ARTHUR FLETCHER WILLIAM; | ||||
| 摘要 | |||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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