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经营范围
发明名称
Electromagnetic transducer
摘要
申请公布号
US2800534(A)
申请公布日期
1957.07.23
申请号
US19560571804
申请日期
1956.03.15
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
BRADFORD REX C.;KELSOF HENRY R.
分类号
G11B5/187;G11B5/40
主分类号
G11B5/187
代理机构
代理人
主权项
地址
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