JPH02138948U - - Google Patents
Info
- Publication number
- JPH02138948U JPH02138948U JP4900889U JP4900889U JPH02138948U JP H02138948 U JPH02138948 U JP H02138948U JP 4900889 U JP4900889 U JP 4900889U JP 4900889 U JP4900889 U JP 4900889U JP H02138948 U JPH02138948 U JP H02138948U
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- light emitting
- emitting diode
- phototransistor
- resistor
- 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
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Audible And Visible Signals (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4900889U JPH067604Y2 (ja) | 1989-04-26 | 1989-04-26 | インターホンの呼出回路 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4900889U JPH067604Y2 (ja) | 1989-04-26 | 1989-04-26 | インターホンの呼出回路 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02138948U true JPH02138948U (un) | 1990-11-20 |
| JPH067604Y2 JPH067604Y2 (ja) | 1994-02-23 |
Family
ID=31566326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4900889U Expired - Lifetime JPH067604Y2 (ja) | 1989-04-26 | 1989-04-26 | インターホンの呼出回路 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067604Y2 (un) |
-
1989
- 1989-04-26 JP JP4900889U patent/JPH067604Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH067604Y2 (ja) | 1994-02-23 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |