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公开(公告)号：US2594342A
公开(公告)日：1952-04-29
申请号：US57627445
申请日：1945-02-05
Applicant: PETTYJOHN DON C
Inventor： PETTYJOHN DON C
IPC: B65G17/02
CPC classification number: B65G17/02 , B65G2201/04
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