Title:
POWER FAILURE MONITOR CIRCUIT FOR KEY TELEPHONE SYSTEM
Document Type and Number:
Japanese Patent JPS5215205
Kind Code:
A
Abstract:
PURPOSE: To obtain a low cost circuit which prevents the loop cut-off of the telephone line at the time of the resumption of power transmission after a power failure with the use one power failure monitoring relay.
Inventors:
SASAI MINORU
KOBAYASHI YASUHISA
KOBAYASHI YASUHISA
Application Number:
JP9072275A
Publication Date:
February 04, 1977
Filing Date:
July 26, 1975
Export Citation:
Assignee:
KANDA TSUSHIN KOGYO KK
International Classes:
H04Q3/58; H04M1/82; (IPC1-7): H04M1/72
Domestic Patent References:
| JPS4717306A |