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公开(公告)号：US2402985A
公开(公告)日：1946-07-02
申请号：US45001842
申请日：1942-07-07
Applicant: BELL TELEPHONE LABOR INC
Inventor： CAUGHEY WILLIAM K , SWARTZEL KARL D
IPC: G11B5/00
CPC classification number: G11B5/00
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