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公开(公告)号：US1420824A
公开(公告)日：1922-06-27
申请号：US47400621
申请日：1921-05-31
Applicant: DONLE HAROLD P
Inventor： DONLE HAROLD P
IPC: H01J17/40
CPC classification number: H01J17/40 , H01J2893/0067
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