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公开(公告)号：US5142184B1
公开(公告)日：1995-11-21
申请号：US47769590
申请日：1990-02-09
Applicant: MOTOROLA INC
Inventor： KANE ROBERT C
CPC classification number: H01J7/44 , H01J3/022 , H01J2201/319
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