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公开(公告)号：US3359655A
公开(公告)日：1967-12-26
申请号：US44921565
申请日：1965-04-19
Applicant: LAB D ELECTRONIQUE ET DE PHYSI
Inventor： MICHEL AUDEBERT
IPC: G09B7/073
CPC classification number: G09B7/073
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