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公开(公告)号：US2868978A
公开(公告)日：1959-01-13
申请号：US60783456
申请日：1956-09-04
Applicant: CUTLER HAMMER INC
Inventor： KEARNEY JOSEPH W , SPENCER WARREN H
CPC classification number: H01J17/005 , H03B29/00
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