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公开(公告)号：US1384288A
公开(公告)日：1921-07-12
申请号：US24656318
申请日：1918-07-24
Applicant: WILSON FRANK R , RINGO ANDREW O
Inventor： WILSON FRANK R , RINGO ANDREW O
IPC: A01D34/06
CPC classification number: A01D34/065
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