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公开(公告)号：US3377722A
公开(公告)日：1968-04-16
申请号：US62248867
申请日：1967-03-13
Applicant: BILLY N. DOWNING
Inventor： DOWNING BILLY N
CPC classification number: A63B25/10 , A43B13/182 , A43B13/184
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