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公开(公告)号：US2322846A
公开(公告)日：1943-06-29
申请号：US34129040
申请日：1940-06-19
Applicant: ALUMINUM CO OF AMERICA
Inventor： PAUL GROWDON JAMES , BLEIFUSS DONALD J
IPC: E02B7/42
CPC classification number: E02B7/42
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