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公开(公告)号：US2927236A
公开(公告)日：1960-03-01
申请号：US54191055
申请日：1955-10-21
Applicant: SCIENT LAB DEVELOPMENTS INC
Inventor： VYTAUTAS ANDRIULIS
IPC: H01J31/20
CPC classification number: H01J31/201
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