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公开(公告)号：US2992005A
公开(公告)日：1961-07-11
申请号：US77056058
申请日：1958-10-29
Applicant: DAVID LOCKHART FRANK
Inventor： DAVID LOCKHART FRANK
IPC: A63B69/36
CPC classification number: A63B69/3676 , A63B2071/024 , A63B2071/0694
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