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公开(公告)号：US2977544A
公开(公告)日：1961-03-28
申请号：US69269357
申请日：1957-10-28
Applicant: GEN MOTORS CORP
Inventor： SCHUBRING NORMAN W , FITCH MERLE E
IPC: G06G7/184
CPC classification number: G06G7/184
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