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公开(公告)号：US2448573A
公开(公告)日：1948-09-07
申请号：US65096246
申请日：1946-02-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： BLAZIER CHARLES R , HALE DOUGLAS A S
IPC: H01J1/20
CPC classification number: H01J1/20
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