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公开(公告)号：US850840A
公开(公告)日：1907-04-16
申请号：US1906322855
申请日：1906-06-22
Applicant: GEORGE OMER , SAMUEL WALLEN , THOMAS R CARSON , LEDFORD JOHN EDWARD
Inventor： LEDFORD JOHN EDWARD
CPC classification number: E05B17/2003 , Y10T292/08 , Y10T292/68 , Y10T292/79
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