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公开(公告)号：US1951656A
公开(公告)日：1934-03-20
申请号：US63945032
申请日：1932-10-25
Applicant: COLUNIBIA PHONOGRAPH COMPANY I
Inventor： HAFFLING ERIC V
IPC: A47K1/08
CPC classification number: A47K1/08 , A47K2201/02
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