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公开(公告)号：US3275881A
公开(公告)日：1966-09-27
申请号：US24744262
申请日：1962-12-18
Applicant: BELL TELEPHONE LABOR INC
Inventor： HYNES ROGER P , WALSH EDWARD J
IPC: H01J31/04
CPC classification number: H01J31/04
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