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公开(公告)号：US2436833A
公开(公告)日：1948-03-02
申请号：US44719442
申请日：1942-06-15
Applicant: INT STANDARD ELECTRIC CORP
Inventor： KARL SPANGENBERG , FIELD LESTER M , ROBERT HELM
CPC classification number: H01J25/10 , H01J25/02 , H01J29/624
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