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公开(公告)号：US2514165A
公开(公告)日：1950-07-04
申请号：US52980144
申请日：1944-04-06
Applicant: M O VALVE CO LTD
Inventor： THOMAS RAMSAY HENRY
IPC: H01J17/54
CPC classification number: H01J17/54
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公开(公告)号：US2423815A
公开(公告)日：1947-07-08
申请号：US46665142
申请日：1942-11-23
Applicant: M O VALVE CO LTD
Inventor： THOMAS RAMSAY HENRY
IPC: H01J17/56
CPC classification number: H01J17/56
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