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发明名称
Magnetron-type phonograph pickup
摘要
申请公布号
US2473820(A)
申请公布日期
1949.06.21
申请号
US19470729820
申请日期
1947.02.20
申请人
RAYTHEON MANUFACTURING COMPANY
发明人
RICHARDS HANS KOHN
分类号
H01J25/50;H04R23/00
主分类号
H01J25/50
代理机构
代理人
主权项
地址
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