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发明名称
Electrodynamic phonograph pickup
摘要
申请公布号
US2478712(A)
申请公布日期
1949.08.09
申请号
US19470739246
申请日期
1947.04.03
申请人
CROSLEY BROADCASTING CORPORATION
发明人
ROEKWELL RONALD J.
分类号
H04R9/12
主分类号
H04R9/12
代理机构
代理人
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地址
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