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公开(公告)号：US2783408A
公开(公告)日：1957-02-26
申请号：US34607853
申请日：1953-04-01
Applicant: ERICSSON TELEPHONES LTD
Inventor： JOHN WILLIAMS DAVID , CLIFFORD BACON RAYMOND , REGINALD ACTON JOHN
IPC: H01J17/49
CPC classification number: H01J17/491
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