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公开(公告)号：US1111381A
公开(公告)日：1914-09-22
申请号：US1912683748
申请日：1912-03-14
Applicant: GEN ELECTRIC
Inventor： HARRADEN WALTER L
CPC classification number: H01J5/48
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公开(公告)号：US1215147A
公开(公告)日：1917-02-06
申请号：US1913751478
申请日：1913-03-01
Applicant: GEN ELECTRIC
Inventor： HALVORSON CROMWELL A B JR , HARRADEN WALTER L
CPC classification number: F21V17/00
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