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公开(公告)号：US2900781A
公开(公告)日：1959-08-25
申请号：US67732857
申请日：1957-08-09
Applicant: JAMES T CLARK
Inventor： SONDIE HENRY P , PRALLE WILLIAM F
IPC: A01D11/06
CPC classification number: A01D11/06
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