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公开(公告)号：US2068628A
公开(公告)日：1937-01-19
申请号：US2623535
申请日：1935-06-12
Applicant: HYGRADE SYLVANIA CORP
Inventor： KRONENWETTER HAROLD P , MOORE EARL E
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0025
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