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公开(公告)号：US1934477A
公开(公告)日：1933-11-07
申请号：US52035531
申请日：1931-03-05
Applicant: GEN ELECTRIC
Inventor： FREDERICK BARTON
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/002 , Y10S428/934
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