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公开(公告)号：US2339806A
公开(公告)日：1944-01-25
申请号：US26533939
申请日：1939-03-31
Applicant: ALUMINUM CO OF AMERICA
Inventor： DOUGIAS PULLEN ALFRED NORMAN
IPC: C25F3/20
CPC classification number: C25F3/20
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