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公开(公告)号：US2379620A
公开(公告)日：1945-07-03
申请号：US43493442
申请日：1942-03-12
Applicant: FRANK BOWLES ALBERT , LIPSIUS HARRY M
Inventor： FRANK BOWLES ALBERT , LIPSIUS HARRY M
CPC classification number: H01J13/34 , H01J13/48 , H01J2893/0087
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