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经营范围
发明名称
Electromagnetic reproducer or recorder
摘要
申请公布号
US1762991(A)
申请公布日期
1930.06.10
申请号
US19270205562
申请日期
1927.07.14
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
JONES WARREN C.
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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