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公开(公告)号：US3492531A
公开(公告)日：1970-01-27
申请号：US3492531D
申请日：1968-01-22
Applicant: FUJITSU LTD
Inventor： OWAKI KENICHI , NAKAYAMA NORIHIKO , IMAHORI YOSHIO
CPC classification number: H01J3/029
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