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1.发明授权
公开(公告)号：US3497674A
公开(公告)日：1970-02-24
申请号：US3497674D
申请日：1967-12-26
Applicant: BAYER AG
Inventor： ZIRNGIBL HANS , BRANDLE KARL , ENGEL KARL , WEIDMANN WALTER , BEUMER PETER
CPC classification number: F24H3/0405
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