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公开(公告)号：US3057271A
公开(公告)日：1962-10-09
申请号：US70264757
申请日：1957-12-13
Applicant: ALUMINUM CO OF AMERICA
Inventor： BUTLER WILLIAM R , MOORE GEORGE L , KEITH WAYNE C , SANBORN JR FREDERICK D
IPC: E04C2/42
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