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公开(公告)号：US2725513A
公开(公告)日：1955-11-29
申请号：US34086853
申请日：1953-03-06
Applicant: CUTLER HAMMER INC
Inventor： ECK ROBERT N , HORNER FRED S
IPC: H02H7/08
CPC classification number: H02H7/0811
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