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经营范围
发明名称
CHARGING PULSE TRANSMISSION SYSTEM
摘要
PURPOSE:A common control signal is used for charging trunks to transmit charging pulses, thereby making a telephone exchangge small-size and economical.
申请公布号
JPS5340205(A)
申请公布日期
1978.04.12
申请号
JP19760114756
申请日期
1976.09.27
申请人
HITACHI LTD
发明人
HISAMURA MAKOTO
分类号
H04M15/00;H04Q3/42
主分类号
H04M15/00
代理机构
代理人
主权项
地址
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