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公开(公告)号：US2352137A
公开(公告)日：1944-06-20
申请号：US42340941
申请日：1941-12-18
Applicant: BELL TELEPHONE LABOR INC
Inventor： THURBER ELMER A
CPC classification number: H01J1/14 , H01J9/045 , Y10T428/2936 , Y10T428/2958
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