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公开(公告)号：US2434898A
公开(公告)日：1948-01-27
申请号：US64159246
申请日：1946-01-16
Applicant: BELL TELEPHONE LABOR INC
Inventor： BASCOM HENRY M , HUBBARD GENEVIEVE M
IPC: H04Q3/42
CPC classification number: H04Q3/42
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