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公开(公告)号：US2152988A
公开(公告)日：1939-04-04
申请号：US2207035
申请日：1935-05-17
Applicant: GEN ELECTRIC
Inventor： WILLEM ELENBASS , BRUNO JONAS GOTTFRIED , WYK AART VAN
CPC classification number: C03C3/091 , F16L13/122 , H01J61/302
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