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公开(公告)号：US2914815A
公开(公告)日：1959-12-01
申请号：US52890355
申请日：1955-08-17
Applicant: COOK ALEXANDER VERNA
Inventor： COOK ALEXANDER VERNA
IPC: E04F15/04
CPC classification number: E04F15/04 , E04F2201/0107 , E04F2201/022 , E04F2201/043
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