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公开(公告)号：US3531716A
公开(公告)日：1970-09-29
申请号：US3531716D
申请日：1968-03-13
Applicant: AGENCY IND SCIENCE TECHN
Inventor： TARUI YASUO , DENDA SEIICHI
IPC: G01R31/305 , G01R31/306 , G01R31/02
CPC classification number: G01R31/306 , G01R31/305
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