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公开(公告)号：US1794746A
公开(公告)日：1931-03-03
申请号：US46097830
申请日：1930-06-13
Applicant: WHITWORTH WILLIAM C
Inventor： WHITWORTH WILLIAM C
IPC: E05F11/00
CPC classification number: E05F11/48 , E05F2700/04 , E05Y2201/668 , Y10T16/698
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