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公开(公告)号：US1823373A
公开(公告)日：1931-09-15
申请号：US11799126
申请日：1926-06-23
Applicant: AMRAD CORP
Inventor： ORSWELL ISRAEL C
IPC: H01J19/50
CPC classification number: H01J19/50 , H01J2893/0008
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