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公开(公告)号：US2650255A
公开(公告)日：1953-08-25
申请号：US19244150
申请日：1950-10-27
Applicant: ASEA AB
Inventor： HOGEL LENNART K G , LUDWIG DREYFUS
CPC classification number: F27B14/061 , F27B14/10
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