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公开(公告)号：US2852803A
公开(公告)日：1958-09-23
申请号：US64894557
申请日：1957-03-27
Applicant: OLSEN CLARENCE C
Inventor： OLSEN CLARENCE C
IPC: E05F1/06
CPC classification number: E05F1/065 , E05Y2201/604 , E05Y2201/638 , E05Y2201/688 , Y10T16/53984
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