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公开(公告)号：US2259470A
公开(公告)日：1941-10-21
申请号：US25525639
申请日：1939-02-08
Applicant: HELMUT JACOBL , WALTER FLEMMING
Inventor： HELMUT JACOBL , WALTER FLEMMING
IPC: C08G75/16
CPC classification number: C08G75/16
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