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公开(公告)号：US2530946A
公开(公告)日：1950-11-21
申请号：US8516149
申请日：1949-04-02
Applicant: BELL TELEPHONE LABOR INC
Inventor： CHESSMAN LEONARD E , MENDENHALL HALLAM E
CPC classification number: H01J1/32 , H01J9/125 , H01J2201/32 , Y10S118/90 , Y10T428/265
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