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公开(公告)号：US2818530A
公开(公告)日：1957-12-31
申请号：US52007355
申请日：1955-07-05
Applicant: MARCONI WIRELESS TELEGRAPH CO
Inventor： GEORGE COLLAR CHARLES
CPC classification number: G05D23/2035 , G05D23/1919 , H01J13/32 , H01J17/28
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