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公开(公告)号：US1850418A
公开(公告)日：1932-03-22
申请号：US33647129
申请日：1929-01-31
Applicant: ALVEY MFG COMPANY
Inventor： SANKEY HENRY C
IPC: B65G47/57
CPC classification number: B65G47/57 , B65G2201/02 , B65G2201/025
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