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经营范围
发明名称
Sound recording and reproducing head
摘要
申请公布号
US2142563(A)
申请公布日期
1939.01.03
申请号
US19340752582
申请日期
1934.11.12
申请人
HARRIS EDWARD R
发明人
HARRIS EDWARD R.
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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