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公开(公告)号：US3501074A
公开(公告)日：1970-03-17
申请号：US3501074D
申请日：1968-05-31
Applicant: ROBERT DAVID EMERICK
Inventor： EMERICK ROBERT DAVID
CPC classification number: F41C33/007 , A45F2003/045 , Y10S224/913
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