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发明名称
TELEPHONY.
摘要
申请公布号
IE11220(L)
申请公布日期
1930.12.11
申请号
IED11220
申请日期
1929.09.04
申请人
ELECTRICAL RESEARCH PRODUCTS, INC.
发明人
分类号
H04B3/10;(IPC1-7):H04B3/10
主分类号
H04B3/10
代理机构
代理人
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