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公开(公告)号：US2496639A
公开(公告)日：1950-02-07
申请号：US66502646
申请日：1946-04-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： RICHARDT JR JOHN W , SHANN OSCAR A
CPC classification number: G01S15/88 , Y10S367/91
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