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公开(公告)号：US2487270A
公开(公告)日：1949-11-08
申请号：US78431247
申请日：1947-11-05
Applicant: ALUMINUM CO OF AMERICA
Inventor： PETERSON WARREN S , WILLMORE CHARLES B
IPC: C01F3/00
CPC classification number: C01F3/005
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