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公开(公告)号：US1632870A
公开(公告)日：1927-06-21
申请号：US14893626
申请日：1926-11-17
Applicant: GEN ELECTRIC CO LTD
Inventor： CHARLES BARTLETT ALBERT , LE ROSSIGNOL ROBERT
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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