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公开(公告)号：US2239018A
公开(公告)日：1941-04-22
申请号：US14262037
申请日：1937-05-14
Applicant: ALUMINUM CO OF AMERICA
Inventor： MIDDLETON ROGERSON WILLIAM
IPC: B23K35/36
CPC classification number: B23K35/3603 , Y10T428/1275
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