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公开(公告)号：US1977992A
公开(公告)日：1934-10-23
申请号：US59417232
申请日：1932-02-20
Applicant: STANDARD IG CO
Inventor： ERNST HOCHSCHWENDER , MAX JOSENHAUS
IPC: C01B3/52
CPC classification number: C01B3/52 , C01B2203/0415 , C01B2203/048
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