BE802750A - Systeme de selection a boutons-poussoirs - Google Patents
Systeme de selection a boutons-poussoirsInfo
- Publication number
- BE802750A BE802750A BE2052941A BE2052941A BE802750A BE 802750 A BE802750 A BE 802750A BE 2052941 A BE2052941 A BE 2052941A BE 2052941 A BE2052941 A BE 2052941A BE 802750 A BE802750 A BE 802750A
- Authority
- BE
- Belgium
- Prior art keywords
- push
- selection system
- button selection
- button
- selection
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Lock And Its Accessories (AREA)
- Input From Keyboards Or The Like (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00275016A US3806662A (en) | 1972-07-25 | 1972-07-25 | Building entrance control system with key-pad control |
Publications (1)
Publication Number | Publication Date |
---|---|
BE802750A true BE802750A (fr) | 1974-01-25 |
Family
ID=23050560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE2052941A BE802750A (fr) | 1972-07-25 | 1973-07-25 | Systeme de selection a boutons-poussoirs |
Country Status (5)
Country | Link |
---|---|
US (1) | US3806662A (fr) |
BE (1) | BE802750A (fr) |
CA (1) | CA1001273A (fr) |
DE (1) | DE2336858A1 (fr) |
IT (1) | IT993606B (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2422806C3 (de) * | 1974-05-10 | 1985-08-29 | Neumann Elektronik GmbH, 4330 Mülheim | Einrichtung zur Konzentration der Linienwahlmittel in einer tastengesteuerten Sprechanlage |
ES2103187B1 (es) * | 1994-10-24 | 1998-04-01 | Gorrochategui Grajirena D Javi | Sistema de comunicacion de dos hilos, para porteros automaticos. |
KR0141159B1 (ko) * | 1995-04-17 | 1998-07-01 | 김광호 | 통화중계 및 주택 경비를 위한 집단주택 제어장치 |
US5784446A (en) * | 1996-11-01 | 1998-07-21 | Cms Investors | Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3484561A (en) * | 1966-07-11 | 1969-12-16 | Automatic Elect Lab | Apartment telephone-intercom and door release system |
US3557318A (en) * | 1966-09-29 | 1971-01-19 | American Telephone & Telegraph | Apartment house telephone system |
FR1569618A (fr) * | 1967-12-08 | 1969-06-06 | ||
US3622710A (en) * | 1968-12-20 | 1971-11-23 | Electro Dynamics & Telecon Ltd | Intercom converter for use with office tone-controlled telephone system |
US3708629A (en) * | 1970-11-30 | 1973-01-02 | Scovill Manufacturing Co | Intercommunication system for apartment, office building and the like |
-
1972
- 1972-07-25 US US00275016A patent/US3806662A/en not_active Expired - Lifetime
-
1973
- 1973-05-09 CA CA170,817A patent/CA1001273A/en not_active Expired
- 1973-07-19 DE DE19732336858 patent/DE2336858A1/de active Pending
- 1973-07-23 IT IT26924/73A patent/IT993606B/it active
- 1973-07-25 BE BE2052941A patent/BE802750A/fr not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
US3806662A (en) | 1974-04-23 |
IT993606B (it) | 1975-09-30 |
DE2336858A1 (de) | 1974-02-07 |
CA1001273A (en) | 1976-12-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RE | Patent lapsed |
Owner name: GTE AUTOMATIC ELECTRIC LABORATORIES INC. Effective date: 19870731 |