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发明名称
Electromagnetic pick up
摘要
申请公布号
US1797197(A)
申请公布日期
1931.03.17
申请号
US19280315803
申请日期
1928.10.29
申请人
RADIO INVENTIONS, INC.
发明人
DONLE HAROLD P.
分类号
H04R11/08
主分类号
H04R11/08
代理机构
代理人
主权项
地址
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