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公开(公告)号：US3548555A
公开(公告)日：1970-12-22
申请号：US3548555D
申请日：1969-01-10
Applicant: ALUMINUM CO OF AMERICA
Inventor： TROSTLE JOHN W , KAMINSKI ELTON G , HASSELBECK RICHARD J
CPC classification number: E06B9/04
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