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公开(公告)号：US3021131A
公开(公告)日：1962-02-13
申请号：US66696357
申请日：1957-06-20
Applicant: LIFTRON CORP
Inventor： BORNEMANN WILLIAM C
IPC: E05F15/16
CPC classification number: E05F15/673 , E05Y2201/43 , E05Y2900/106
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