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公开(公告)号：US3399440A
公开(公告)日：1968-09-03
申请号：US57372966
申请日：1966-08-19
Applicant: MOTOROLA INC
Inventor： BLUMENBERG HORST H , WOLKOFF EDWARD J
CPC classification number: H01J29/506 , H01J31/205
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