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公开(公告)号：US1838885A
公开(公告)日：1931-12-29
申请号：US45013630
申请日：1930-05-06
Applicant: CROCKER MCELWAIN COMPANY
Inventor： TUCKER ELMER C , ROCHE FRANK J
IPC: B65G51/02
CPC classification number: B65G51/02
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