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公开(公告)号：US2633974A
公开(公告)日：1953-04-07
申请号：US19612050
申请日：1950-11-17
Applicant: HEWITT ROBINS INC
Inventor： JACKSON REUBEN U
CPC classification number: B65G47/95 , B65G21/14 , B65G21/16 , B65G2201/04
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