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发明名称
Electromagnetic pickup unit
摘要
申请公布号
US2488504(A)
申请公布日期
1949.11.15
申请号
US19490101344
申请日期
1949.06.25
申请人
ROCKWELL RONALD J
发明人
ROCKWELL RONALD J.
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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