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公开(公告)号：US2117636A
公开(公告)日：1938-05-17
申请号：US71715234
申请日：1934-03-24
Applicant: TJOFLAT GERALD B
Inventor： TJOFLAT GERALD B
IPC: H01J1/28
CPC classification number: H01J1/28 , Y10T428/12139
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公开(公告)号：US1993633A
公开(公告)日：1935-03-05
申请号：US57793931
申请日：1931-11-30
Applicant: TJOFLAT GERALD B
Inventor： TJOFLAT GERALD B
IPC: H01H51/20
CPC classification number: H01H51/20
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