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公开(公告)号：US1854926A
公开(公告)日：1932-04-19
申请号：US45960930
申请日：1930-06-06
Applicant: DE BROSKE ERNEST D
Inventor： DE BROSKE ERNEST D
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0023 , Y10T428/30 , Y10T428/31678
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