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公开(公告)号：US1879117A
公开(公告)日：1932-09-27
申请号：US48052930
申请日：1930-09-08
Applicant: JAMES DAVIDSON EARL
Inventor： JAMES DAVIDSON EARL
CPC classification number: A63B53/06 , A63B53/047 , A63B53/0487 , A63B2053/026
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