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公开(公告)号：US863920A
公开(公告)日：1907-08-20
申请号：US1907364184
申请日：1907-03-23
Applicant: HELMER ROBERT , STUTE WILLIAM F JR
Inventor： HELMER ROBERT , STUTE WILLIAM F JR
CPC classification number: E05B65/0007 , Y10T292/0903
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