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公开(公告)号：US1562396A
公开(公告)日：1925-11-17
申请号：US64323423
申请日：1923-06-04
Applicant: WESTERN ELECTRIC CO
Inventor： WARD FRANK E
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003 , Y10T29/49915 , Y10T29/49938 , Y10T74/20708 , Y10T403/4648 , Y10T403/49
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