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经营范围
发明名称
FREQUENCY DISCRIMINATION CIRCUIT
摘要
PURPOSE:The sine wave signal is discriminated when the calling party cuts off telephone, recording is stopped. To make this possible, automatic telephone, recording answering device is controlled.
申请公布号
JPS5252508(A)
申请公布日期
1977.04.27
申请号
JP19750128280
申请日期
1975.10.27
申请人
HITACHI LTD
发明人
CHIBA KAORU
分类号
H04M1/65;H04M1/82
主分类号
H04M1/65
代理机构
代理人
主权项
地址
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