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公开(公告)号：US2268510A
公开(公告)日：1941-12-30
申请号：US37287641
申请日：1941-01-02
Applicant: HYGRADE SYLVANIA CORP
Inventor： KULBERG AUGUST E , THOMAS RALPH B
IPC: H01J5/24
CPC classification number: H01J5/24 , H01J2893/0039 , Y10S65/04
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