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公开(公告)号：US3210917A
公开(公告)日：1965-10-12
申请号：US13464561
申请日：1961-08-29
Applicant: FMC CORP
Inventor： JOHN BOYCE , MELTON ADRUS C
IPC: A01D45/22
CPC classification number: A01D45/22
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