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公开(公告)号：US2528569A
公开(公告)日：1950-11-07
申请号：US67854646
申请日：1946-06-22
Applicant: FED TELECOMM LAB INC
Inventor： YOUNG JR NORMAN H , FRENCH HAYWARD A
IPC: G05F1/52
CPC classification number: G05F1/52
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