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公开(公告)号：US2970256A
公开(公告)日：1961-01-31
申请号：US48574255
申请日：1955-02-02
Applicant: GEN MOTORS CORP
Inventor： SAZYNSKI JOHN J , WHITE JOSEPH F
IPC: G01N27/90
CPC classification number: G01N27/9093
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