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公开(公告)号：US2192551A
公开(公告)日：1940-03-05
申请号：US19959638
申请日：1938-04-02
Applicant: GEN SCIENTIFIC CORP
Inventor： FRANK KASPAR
IPC: H01J17/06
CPC classification number: H01J17/066 , H01J2893/0066
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公开(公告)号：US2229329A
公开(公告)日：1941-01-21
申请号：US19959738
申请日：1938-04-02
Applicant: GEN SCIENTIFIC CORP
Inventor： FRANK KASPAR
IPC: H01J17/06
CPC classification number: H01J17/066 , H01J2893/0066
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公开(公告)号：US2153375A
公开(公告)日：1939-04-04
申请号：US23414738
申请日：1938-10-10
Applicant: GEN SCIENTIFIC CORP
Inventor： FRANK KASPAR
IPC: H01J17/06
CPC classification number: H01J17/066 , H01J2893/0066
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