JPH01167785U - - Google Patents
Info
- Publication number
- JPH01167785U JPH01167785U JP6441788U JP6441788U JPH01167785U JP H01167785 U JPH01167785 U JP H01167785U JP 6441788 U JP6441788 U JP 6441788U JP 6441788 U JP6441788 U JP 6441788U JP H01167785 U JPH01167785 U JP H01167785U
- Authority
- JP
- Japan
- Prior art keywords
- telephone
- circuit
- detects
- low frequency
- frequency pulse
- 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
- 238000001514 detection method Methods 0.000 claims 2
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Devices For Supply Of Signal Current (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6441788U JPH071879Y2 (ja) | 1988-05-18 | 1988-05-18 | ボタン電話装置の応答検出回路 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6441788U JPH071879Y2 (ja) | 1988-05-18 | 1988-05-18 | ボタン電話装置の応答検出回路 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01167785U true JPH01167785U (pt) | 1989-11-27 |
| JPH071879Y2 JPH071879Y2 (ja) | 1995-01-18 |
Family
ID=31289884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6441788U Expired - Lifetime JPH071879Y2 (ja) | 1988-05-18 | 1988-05-18 | ボタン電話装置の応答検出回路 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH071879Y2 (pt) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0497694A (ja) * | 1990-08-15 | 1992-03-30 | Oki Electric Ind Co Ltd | ボタン電話装置の内線着信応答監視回路及びその監視方法 |
-
1988
- 1988-05-18 JP JP6441788U patent/JPH071879Y2/ja not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0497694A (ja) * | 1990-08-15 | 1992-03-30 | Oki Electric Ind Co Ltd | ボタン電話装置の内線着信応答監視回路及びその監視方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH071879Y2 (ja) | 1995-01-18 |
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