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发明名称
Electrical communication system
摘要
申请公布号
GB531394(A)
申请公布日期
1941.01.03
申请号
GB19390020130
申请日期
1939.07.11
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04B1/46;H04B3/20;H04M11/06
主分类号
H04B1/46
代理机构
代理人
主权项
地址
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