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经营范围
发明名称
Recording system
摘要
申请公布号
US2197342(A)
申请公布日期
1940.04.16
申请号
US19380231159
申请日期
1938.09.22
申请人
ELECTRICAL RESEARCH PRODUCTS, INC.
发明人
KEITH CLYDE R.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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