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公开(公告)号：US2834941A
公开(公告)日：1958-05-13
申请号：US34047453
申请日：1953-03-05
Applicant: CLEVELAND PATENTS INC , AUTO TEST INC
Inventor： HICKOK JR ROBERT D , STERLING DAVIES , YENNI WILLIAM H
IPC: G01R1/22
CPC classification number: G01R1/22
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