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经营范围
发明名称
Improvements in or relating to transmission systems such as long distance telephone systems
摘要
申请公布号
GB396444(A)
申请公布日期
1933.08.04
申请号
GB19320003370
申请日期
1932.02.04
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
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地址
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