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公开(公告)号：US3394977A
公开(公告)日：1968-07-30
申请号：US34552364
申请日：1964-02-17
Applicant: COMMW SCIENT IND RES ORG
Inventor： MALCOLM STIFF GEOFFREY
CPC classification number: G21K1/04 , G01J3/04 , H01J49/025
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