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公开(公告)号：US3510968A
公开(公告)日：1970-05-12
申请号：US3510968D
申请日：1968-06-26
Applicant: USM CORP
Inventor： HOBBS RALPH E JR , YARRISON WALTER W
CPC classification number: B29D35/061 , A43B13/12 , B29D35/082
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