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公开(公告)号：US2998121A
公开(公告)日：1961-08-29
申请号：US70760058
申请日：1958-01-07
Applicant: GILBERT NORMAN W
Inventor： GILBERT NORMAN W
IPC: B65G15/42
CPC classification number: B65G15/42 , B65G2201/02
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