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发明名称
MONITORING SYSTEM FOR EXTENSION LOCKOUT
摘要
PURPOSE:To reduce power consumption and to prevent heating of line relays, by decreasing the operating time of line relays, through monitoring the restoration of the line relays at the connection between subscribers and line circuits.
申请公布号
JPS53143108(A)
申请公布日期
1978.12.13
申请号
JP19770057568
申请日期
1977.05.20
申请人
NIPPON ELECTRIC CO
发明人
HASHIMOTO SHIYUUICHI;OKA SHIYUUJI
分类号
H04M3/14;H04M3/12
主分类号
H04M3/14
代理机构
代理人
主权项
地址
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