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公开(公告)号：US2198769A
公开(公告)日：1940-04-30
申请号：US21886538
申请日：1938-07-12
Applicant: FED TELEGRAPH CO
Inventor： LYNN GOODALE
CPC classification number: H01J5/26 , H01J5/42 , H01J2893/0034 , H01J2893/0043 , Y10S228/902 , Y10S228/903 , Y10T403/477
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公开(公告)号：US2192375A
公开(公告)日：1940-03-05
申请号：US25559339
申请日：1939-02-10
Applicant: FED TELEGRAPH CO
Inventor： LYNN GOODALE
IPC: H01J19/38
CPC classification number: H01J19/38 , H01J2893/0015
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