JPS55130454U - - Google Patents
Info
- Publication number
- JPS55130454U JPS55130454U JP1979028661U JP2866179U JPS55130454U JP S55130454 U JPS55130454 U JP S55130454U JP 1979028661 U JP1979028661 U JP 1979028661U JP 2866179 U JP2866179 U JP 2866179U JP S55130454 U JPS55130454 U JP S55130454U
- Authority
- JP
- Japan
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979028661U JPS55130454U (2) | 1979-03-08 | 1979-03-08 | |
| US06/129,164 US4327254A (en) | 1979-03-08 | 1980-03-10 | Ringer circuit for telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979028661U JPS55130454U (2) | 1979-03-08 | 1979-03-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55130454U true JPS55130454U (2) | 1980-09-16 |
Family
ID=12254678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979028661U Pending JPS55130454U (2) | 1979-03-08 | 1979-03-08 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4327254A (2) |
| JP (1) | JPS55130454U (2) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3254161A (en) * | 1963-01-17 | 1966-05-31 | North Electric Co | Ringing arrangement for substation telephone instrument |
| US3291916A (en) * | 1963-08-23 | 1966-12-13 | Stromberg Carlson Corp | Signaling system |
| GB1086702A (en) * | 1964-10-15 | 1967-10-11 | Post Office | Electrical calling circuits |
| CA915763A (en) * | 1971-05-28 | 1972-11-28 | Microsystems International Limited | Impedance matching circuit for driving a tone ringer or the like |
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1979
- 1979-03-08 JP JP1979028661U patent/JPS55130454U/ja active Pending
-
1980
- 1980-03-10 US US06/129,164 patent/US4327254A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4327254A (en) | 1982-04-27 |