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公开(公告)号：US1341006A
公开(公告)日：1920-05-25
申请号：US12493916
申请日：1916-10-11
Applicant: JOHN NEILSON
Inventor： DUDLEY BABCOCK CLIFFORD
IPC: H01J19/02
CPC classification number: H01J19/02 , H01J2893/0001
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