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公开(公告)号：US702758A
公开(公告)日：1902-06-17
申请号：US1900039742
申请日：1900-12-13
Applicant: INTERNAT ACHESON GRAPHITE COMPANY
Inventor： ACHESON EDWARD G
CPC classification number: C01B31/00 , C01B32/00 , C04B35/532
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