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公开(公告)号：US2890385A
公开(公告)日：1959-06-09
申请号：US58941356
申请日：1956-06-05
Applicant: MACHLETT LAB INC
Inventor： CHESTER KIRKA
IPC: H01J5/54
CPC classification number: H01J5/54
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公开(公告)号：US2958006A
公开(公告)日：1960-10-25
申请号：US58946956
申请日：1956-06-05
Applicant: MACHLETT LAB INC
Inventor： CHESTER KIRKA
CPC classification number: H01J5/54
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