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公开(公告)号：US2159800A
公开(公告)日：1939-05-23
申请号：US20071738
申请日：1938-04-07
Applicant: GEN ELECTRIC
Inventor： KELLER KARL H
IPC: H01K3/06
CPC classification number: H01K3/06
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公开(公告)号：US2326344A
公开(公告)日：1943-08-10
申请号：US39964641
申请日：1941-06-25
Applicant: GEN ELECTRIC
Inventor： ELMENDORF DURYEA E , KELLER KARL H
CPC classification number: G01N27/9046 , G01V3/101
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