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经营范围
发明名称
TELEPHONIC TRANSMISSION.
摘要
申请公布号
IE12384(L)
申请公布日期
1931.09.08
申请号
IED12384
申请日期
1931.02.27
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04B3/20;(IPC1-7):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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