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公开(公告)号：US2972387A
公开(公告)日：1961-02-21
申请号：US78396658
申请日：1958-12-30
Applicant: ALLIS CHALMERS MFG CO
Inventor： SEVERSON WILMER M
IPC: A01C7/20
CPC classification number: A01C7/201 , Y10T29/49895 , Y10T403/32377
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