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公开(公告)号：US3333617A
公开(公告)日：1967-08-01
申请号：US45339965
申请日：1965-05-05
Applicant: FORTSCHRITT VEB K
Inventor： GOTTFRIED HOHLFELD , HEINZ MARTIN
IPC: A01F29/16
CPC classification number: A01F29/16
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