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公开(公告)号：US3548485A
公开(公告)日：1970-12-22
申请号：US3548485D
申请日：1968-04-29
Applicant: YOUNG JAMES M
Inventor： YOUNG JAMES M
CPC classification number: B28B23/22 , E01D2/04 , E04C3/22 , Y10T29/49874
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