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公开(公告)号：US3073474A
公开(公告)日：1963-01-15
申请号：US76106058
申请日：1958-09-15
Applicant: GIBSON FRED M , PRESTON WILLIAM E
Inventor： GIBSON FRED M , PRESTON WILLIAM E
IPC: B25B31/00
CPC classification number: B25B31/00
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