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公开(公告)号：US3133144A
公开(公告)日：1964-05-12
申请号：US21731962
申请日：1962-08-16
Applicant: BELL TELEPHONE LABOR INC
Inventor： COTTINGHAM WILLIAM B , KUNZLER JOHN E
CPC classification number: H01F6/065 , F17C3/085 , F17C2203/0687 , F17C2221/014 , F17C2221/017 , F17C2270/0509 , Y10S505/885
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