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公开(公告)号：US2177966A
公开(公告)日：1939-10-31
申请号：US12265637
申请日：1937-01-27
Applicant: GEN MOTORS CORP
Inventor： WALLER DONALD D , SMITH LUCIAN B , RANDOLPH DONALD W , HELGEBY RALPH O
IPC: B60Q1/54
CPC classification number: G01P1/07
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