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公开(公告)号：US2968764A
公开(公告)日：1961-01-17
申请号：US67901957
申请日：1957-08-19
Applicant: GEN MOTORS CORP
Inventor： GREENLEY HAROLD H , SMITH LUCIAN B
IPC: G01R5/14
CPC classification number: G01R5/14
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