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公开(公告)号：US2049238A
公开(公告)日：1936-07-28
申请号：US63832432
申请日：1932-10-18
Applicant: AEG
Inventor： MAX WETH , WILHELM TRAUB
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/002
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