JPS5279708A - Key telephone system - Google Patents
Key telephone systemInfo
- Publication number
- JPS5279708A JPS5279708A JP15672775A JP15672775A JPS5279708A JP S5279708 A JPS5279708 A JP S5279708A JP 15672775 A JP15672775 A JP 15672775A JP 15672775 A JP15672775 A JP 15672775A JP S5279708 A JPS5279708 A JP S5279708A
- Authority
- JP
- Japan
- Prior art keywords
- telephone system
- key telephone
- thru
- expenses
- outgoing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/02—Arrangements for interconnection not involving centralised switching involving a common line for all parties
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15672775A JPS5279708A (en) | 1975-12-26 | 1975-12-26 | Key telephone system |
US05/967,017 US4254306A (en) | 1975-12-26 | 1978-12-06 | Key telephone system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15672775A JPS5279708A (en) | 1975-12-26 | 1975-12-26 | Key telephone system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5279708A true JPS5279708A (en) | 1977-07-05 |
JPS5440405B2 JPS5440405B2 (sv) | 1979-12-03 |
Family
ID=15634001
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15672775A Granted JPS5279708A (en) | 1975-12-26 | 1975-12-26 | Key telephone system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5279708A (sv) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52104008A (en) * | 1976-02-27 | 1977-09-01 | Taiko Denki Seisakusho:Kk | Connecting method of button telephone apparatus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5051507U (sv) * | 1973-09-07 | 1975-05-19 |
-
1975
- 1975-12-26 JP JP15672775A patent/JPS5279708A/ja active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5051507U (sv) * | 1973-09-07 | 1975-05-19 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52104008A (en) * | 1976-02-27 | 1977-09-01 | Taiko Denki Seisakusho:Kk | Connecting method of button telephone apparatus |
JPS5522987B2 (sv) * | 1976-02-27 | 1980-06-20 |
Also Published As
Publication number | Publication date |
---|---|
JPS5440405B2 (sv) | 1979-12-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5279707A (en) | Key telephone main unit | |
JPS5279708A (en) | Key telephone system | |
JPS5279706A (en) | Subscriber line calling system in key telephone unit | |
JPS5279704A (en) | Holding system in key telephone system | |
JPS5414107A (en) | Telephone unit for secretary and manager | |
JPS5279705A (en) | Privacy circuit in key telephone unit | |
CA643317A (en) | Party line telephone system | |
JPS52120709A (en) | Common line signal system | |
JPS5410602A (en) | Communication system for key telephone system | |
JPS5410604A (en) | Main wire holding circuit for key telephone system | |
JPS5276805A (en) | Telephone service system | |
JPS5234602A (en) | Multiple office interphone equipment | |
CA594844A (en) | Telephone conference system | |
CA602932A (en) | Telephone conference system | |
JPS526404A (en) | Calling system of the button telephone set | |
JPS5342508A (en) | Automatic test system for telephone lines | |
CA605038A (en) | Party line electrical communication systems | |
CA576327A (en) | Traffic supervisory arrangements in telephone systems | |
JPS52140207A (en) | Telephone service system | |
CA815601A (en) | Telephone system with added main line subscriber facilities | |
CA599262A (en) | Party line telephone systems | |
CA610800A (en) | Telecommunication exchange systems | |
JPS5410605A (en) | Privacy system for key telephone system | |
CA605782A (en) | Loud-speaking telephone systems | |
CA608174A (en) | Multiplex communication system |