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公开(公告)号：US1796265A
公开(公告)日：1931-03-10
申请号：US21498627
申请日：1927-08-23
Applicant: DEGUSSA
Inventor： HERMANN FREUDENBERG , HARRY KLOEPFER
IPC: C01B6/04
CPC classification number: C01B6/04
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