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公开(公告)号：US2145400A
公开(公告)日：1939-01-31
申请号：US11310936
申请日：1936-11-28
Applicant: ALBERT LOPPACKER
Inventor： LOPPACKER EVERETT P
IPC: H01J19/28
CPC classification number: H01J19/28 , H01J2893/0013
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