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经营范围
发明名称
Magnetic telegraphophone transducer
摘要
申请公布号
US2660622(A)
申请公布日期
1953.11.24
申请号
US19490118034
申请日期
1949.09.27
申请人
ENGINEERING RESEARCH ASSOCIATES, INC.
发明人
FIELD WILLIAM J.;PERKINS ROBERT L.
分类号
G11B5/147;G11B5/187
主分类号
G11B5/147
代理机构
代理人
主权项
地址
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