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公开(公告)号：US2333842A
公开(公告)日：1943-11-09
申请号：US45030842
申请日：1942-07-09
Applicant: HENRY A DE PHILLIPS
Inventor： DOMENICO CASCIO , KOCH STANLEY J
IPC: H01J33/00
CPC classification number: H01J33/00
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