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公开(公告)号：US2648793A
公开(公告)日：1953-08-11
申请号：US16046150
申请日：1950-05-06
Applicant: ROBERT DOLLAR COMPANY
Inventor： WELTIS WIHTOL
IPC: H01J19/28
CPC classification number: H01J19/28 , H01J2893/0013
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