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公开(公告)号：US3071699A
公开(公告)日：1963-01-01
申请号：US80123759
申请日：1959-03-23
Applicant: SQUARE D CO
Inventor： ECKL JAMES J , MEYER CHARLES F
IPC: G01V3/10
CPC classification number: G01V3/107
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