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公开(公告)号：US2240224A
公开(公告)日：1941-04-29
申请号：US15190837
申请日：1937-07-03
Applicant: NANCE WILLIAM E , STONE JAMES B
Inventor： NANCE WILLIAM E , STONE JAMES B
IPC: A01G13/06
CPC classification number: A01G13/06
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