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公开(公告)号：US2598247A
公开(公告)日：1952-05-27
申请号：US5370448
申请日：1948-10-09
Applicant: MOTOROLA INC
Inventor： NEIL FRIHART HENRY , HASSLER EDWIN B
IPC: H01F27/00
CPC classification number: H01F27/004
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