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公开(公告)号：US1421178A
公开(公告)日：1922-06-27
申请号：US39964420
申请日：1920-07-28
Applicant: CLARANCE DAVIS CHARLES
Inventor： CLARANCE DAVIS CHARLES
IPC: B65G17/38
CPC classification number: B65G17/38 , B65G2201/06
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