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公开(公告)号：US3490308A
公开(公告)日：1970-01-20
申请号：US3490308D
申请日：1968-06-06
Applicant: GEN MOTORS CORP
Inventor： KELLER ROBERT C , DRAKE LARRY K
IPC: G05G11/00
CPC classification number: G05G11/00 , Y10T74/20091 , Y10T74/20256
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