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公开(公告)号：US2809030A
公开(公告)日：1957-10-08
申请号：US54833355
申请日：1955-11-22
Applicant: CLARK FLOYD R
Inventor： CLARK FLOYD R
IPC: E05F11/32
CPC classification number: E05F11/32 , E05F11/54 , E05Y2201/676 , E05Y2800/00
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