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1.发明授权
公开(公告)号：US3508863A
公开(公告)日：1970-04-28
申请号：US3508863D
申请日：1967-05-19
Applicant: TAMPELLA OY AB
Inventor： KIMINKI KEIJO R T , KESKINEN LAURI K
CPC classification number: C01B17/165 , C01B17/164 , C01D7/02 , Y10S423/03
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