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发明名称
DIAL PULSE RECEIVING FACILITY FOR KEY DIALLING CODE SIGNALS FORMED OF A DIRECT CURRENT KEY SIGNAL AND A SPEECH-IMMUNE VOICE-FREQUENCY SIGNAL COMBINATION
摘要
申请公布号
CA810260(A)
申请公布日期
1969.04.08
申请号
CAD810260
申请日期
申请人
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
发明人
OTTO BAADE;LORENZ GASSER
分类号
主分类号
代理机构
代理人
主权项
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