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公开(公告)号：US3099190A
公开(公告)日：1963-07-30
申请号：US8642661
申请日：1961-02-01
Applicant: SMITH CORP A O
Inventor： ALLEN JR CHESTER , FREERK BERKLOO
CPC classification number: B29C63/105 , B29C53/581 , B29C53/8016
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