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公开(公告)号：US2880847A
公开(公告)日：1959-04-07
申请号：US50288055
申请日：1955-04-21
Applicant: KELLEY GEORGE B
Inventor： KELLEY GEORGE B
IPC: B65G21/16
CPC classification number: B65G21/16 , B65G2201/02
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