KR200165096Y1 - Doorphone circuit connected with a key telephone system - Google Patents
Doorphone circuit connected with a key telephone system Download PDFInfo
- Publication number
- KR200165096Y1 KR200165096Y1 KR2019970024244U KR19970024244U KR200165096Y1 KR 200165096 Y1 KR200165096 Y1 KR 200165096Y1 KR 2019970024244 U KR2019970024244 U KR 2019970024244U KR 19970024244 U KR19970024244 U KR 19970024244U KR 200165096 Y1 KR200165096 Y1 KR 200165096Y1
- Authority
- KR
- South Korea
- Prior art keywords
- circuit connected
- telephone system
- key telephone
- doorphone
- doorphone circuit
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
- H04M11/025—Door telephones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019970024244U KR200165096Y1 (en) | 1997-08-30 | 1997-08-30 | Doorphone circuit connected with a key telephone system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019970024244U KR200165096Y1 (en) | 1997-08-30 | 1997-08-30 | Doorphone circuit connected with a key telephone system |
Publications (2)
Publication Number | Publication Date |
---|---|
KR19990010913U KR19990010913U (ko) | 1999-03-25 |
KR200165096Y1 true KR200165096Y1 (en) | 2000-01-15 |
Family
ID=19509299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR2019970024244U KR200165096Y1 (en) | 1997-08-30 | 1997-08-30 | Doorphone circuit connected with a key telephone system |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR200165096Y1 (ko) |
-
1997
- 1997-08-30 KR KR2019970024244U patent/KR200165096Y1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR19990010913U (ko) | 1999-03-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E701 | Decision to grant or registration of patent right | ||
REGI | Registration of establishment | ||
FPAY | Annual fee payment |
Payment date: 20070910 Year of fee payment: 9 |
|
LAPS | Lapse due to unpaid annual fee |