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公开(公告)号：US2985187A
公开(公告)日：1961-05-23
申请号：US1522660
申请日：1960-03-15
Applicant: HAMILTON ODELL A
Inventor： HAMILTON ODELL A
IPC: E03F7/00
CPC classification number: E03F7/00 , E03F2201/40 , Y10T137/4273 , Y10T137/4613 , Y10T137/8342
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