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公开(公告)号：US2309642A
公开(公告)日：1943-02-02
申请号：US37000740
申请日：1940-12-13
Applicant: RAYTHEON PRODUCTION CORP
Inventor： ROBERT GRAY
IPC: H01J1/00
CPC classification number: H01J1/00 , H01J2893/0051
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