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公开(公告)号：US2884298A
公开(公告)日：1959-04-28
申请号：US61146556
申请日：1956-09-24
Applicant: BRYEN THOMAS T
Inventor： BRYEN THOMAS T
IPC: H01J9/50
CPC classification number: H01J9/50 , H01J2893/0072 , Y02W30/828
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