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公开(公告)号：US3197412A
公开(公告)日：1965-07-27
申请号：US31740063
申请日：1963-10-15
Applicant: BELL TELEPHONE LABOR INC
Inventor： GYORGY ERNST M , SCHNETTLER FRANK J
CPC classification number: C04B35/2633 , C04B35/2625 , C04B35/2658 , C04B35/2683 , H01F1/0313
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