FR2172190B1 - - Google Patents
Info
- Publication number
- FR2172190B1 FR2172190B1 FR7305085A FR7305085A FR2172190B1 FR 2172190 B1 FR2172190 B1 FR 2172190B1 FR 7305085 A FR7305085 A FR 7305085A FR 7305085 A FR7305085 A FR 7305085A FR 2172190 B1 FR2172190 B1 FR 2172190B1
- Authority
- FR
- France
- 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.)
- Expired
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
-
- 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
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB731572 | 1972-02-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2172190A1 FR2172190A1 (US06590051-20030708-C00023.png) | 1973-09-28 |
FR2172190B1 true FR2172190B1 (US06590051-20030708-C00023.png) | 1979-01-26 |
Family
ID=9830791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7305085A Expired FR2172190B1 (US06590051-20030708-C00023.png) | 1972-02-17 | 1973-02-08 |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2307316A1 (US06590051-20030708-C00023.png) |
ES (1) | ES411724A1 (US06590051-20030708-C00023.png) |
FR (1) | FR2172190B1 (US06590051-20030708-C00023.png) |
GB (1) | GB1347929A (US06590051-20030708-C00023.png) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2453730A1 (de) | 1972-08-03 | 1976-05-20 | Itt Ind Gmbh Deutsche | Verfahren und schaltungsanordnung zum ueberspannungsschutz von transistoren von betriebsschaltungen eines telefonapparates |
DE2462048C2 (de) * | 1974-03-09 | 1984-07-12 | Deutsche Itt Industries Gmbh, 7800 Freiburg | Schaltungsanordnung für einen Telefonapparat mit Wahltastatur |
FR2319256A1 (fr) * | 1975-07-23 | 1977-02-18 | Bailleul Roland | Circuits electroniques et electromagnetiques permettant l'adaptation d'un clavier numerique a un poste telephonique a cadran d'appel par quatre fils |
DE2536201C2 (de) * | 1975-08-13 | 1982-06-03 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Schaltungsanordnung für Fernmeldeanlagen insbesondere für Fernsprechapparate zur Abgabe von Wählimpulsen mit einem Transistor |
DE2848986C3 (de) * | 1976-09-15 | 1981-10-08 | Krone Gmbh, 1000 Berlin | Schaltungsanordnung für einen Fernsprechapparat mit Wähltastatur nach dem Impulswahl-Verfahren |
ATA677778A (de) * | 1978-09-20 | 1984-02-15 | Siemens Ag Oesterreich | Schaltung fuer fernmelde-, insbesondere fernsprech-teilnehmerstellen, sowie uebertragungen mit impulsgebender wahlsteuerung |
GB2132447B (en) * | 1982-12-04 | 1986-07-30 | Standard Telephones Cables Ltd | Switch device |
-
1972
- 1972-02-17 GB GB1347929D patent/GB1347929A/en not_active Expired
-
1973
- 1973-02-08 FR FR7305085A patent/FR2172190B1/fr not_active Expired
- 1973-02-14 DE DE19732307316 patent/DE2307316A1/de not_active Withdrawn
- 1973-02-17 ES ES411724A patent/ES411724A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES411724A1 (es) | 1976-01-01 |
GB1347929A (en) | 1974-02-27 |
FR2172190A1 (US06590051-20030708-C00023.png) | 1973-09-28 |
DE2307316A1 (de) | 1973-08-23 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |