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公开(公告)号：US2246946A
公开(公告)日：1941-06-24
申请号：US33328640
申请日：1940-05-04
Applicant: LEO LUPO
Inventor： LEO LUPO
IPC: A01C7/08
CPC classification number: A01C7/08 , Y10S111/901
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