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公开(公告)号：US2257512A
公开(公告)日：1941-09-30
申请号：US28191839
申请日：1939-06-29
Applicant: SAMUEL OLSON MFG COMPANY INC
Inventor： SAMUEL OLSON , LENFESTEY PERCY E
IPC: B65G47/48
CPC classification number: B65G47/48 , B65G47/487
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