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公开(公告)号：US2147791A
公开(公告)日：1939-02-21
申请号：US75431834
申请日：1934-11-22
Applicant: PHILIPS NV
Inventor： GILLES HOLST , WILLEM SIX , LOUIS SNOEK JACOB , GERARD BURGERS WILHELM
IPC: C21D8/12
CPC classification number: C21D8/1233 , C21D8/1266
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