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公开(公告)号：US2544253A
公开(公告)日：1951-03-06
申请号：US9257649
申请日：1949-05-11
Applicant: GEORGE W HOULSBY JR
Inventor： MARTIN CARLSON , MICHAELSEN OTTO D
IPC: E05F3/00
CPC classification number: E05F3/00 , E05F3/226 , E05Y2900/132 , Y10T16/2774
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