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公开(公告)号：US2700952A
公开(公告)日：1955-02-01
申请号：US20197950
申请日：1950-12-21
Applicant: AUDIO DEVICES INC
Inventor： SPEED WILLIAM C , DWYER JAMES J
IPC: G11B5/84
CPC classification number: G11B5/84
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