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公开(公告)号：US3152315A
公开(公告)日：1964-10-06
申请号：US8541361
申请日：1961-01-27
Applicant: LAB FOR ELECTRONICS INC
Inventor： MONTGOMERY RODGERS LIONEL
IPC: G08G5/00
CPC classification number: G08G5/0026 , G08G5/065
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