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发明名称
Selective circuits for voice frequency carrier telegraph systems
摘要
申请公布号
US1944559(A)
申请公布日期
1934.01.23
申请号
US19310519415
申请日期
1931.03.02
申请人
INTERNATIONAL COMMUNICATIONS LABORATORIES, INC.
发明人
KELLEY LEO A.
分类号
H03H7/075
主分类号
H03H7/075
代理机构
代理人
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