JPH01110540U - - Google Patents
Info
- Publication number
- JPH01110540U JPH01110540U JP677488U JP677488U JPH01110540U JP H01110540 U JPH01110540 U JP H01110540U JP 677488 U JP677488 U JP 677488U JP 677488 U JP677488 U JP 677488U JP H01110540 U JPH01110540 U JP H01110540U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- notification
- level
- handset
- 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.)
- Pending
Links
- 238000009499 grossing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 5
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Closed-Circuit Television Systems (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP677488U JPH01110540U (en]) | 1988-01-21 | 1988-01-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP677488U JPH01110540U (en]) | 1988-01-21 | 1988-01-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01110540U true JPH01110540U (en]) | 1989-07-26 |
Family
ID=31211226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP677488U Pending JPH01110540U (en]) | 1988-01-21 | 1988-01-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01110540U (en]) |
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1988
- 1988-01-21 JP JP677488U patent/JPH01110540U/ja active Pending