SE7809541L - Kopplingsanordning for en anrops-, porttelefon- och portoppningsanleggning - Google Patents
Kopplingsanordning for en anrops-, porttelefon- och portoppningsanleggningInfo
- Publication number
- SE7809541L SE7809541L SE7809541A SE7809541A SE7809541L SE 7809541 L SE7809541 L SE 7809541L SE 7809541 A SE7809541 A SE 7809541A SE 7809541 A SE7809541 A SE 7809541A SE 7809541 L SE7809541 L SE 7809541L
- Authority
- SE
- Sweden
- Prior art keywords
- door
- call
- coupling device
- opening system
- door opening
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2741160A DE2741160C2 (de) | 1977-09-13 | 1977-09-13 | Schaltungsanordnung für eine Ruf-, Türwechselsprech- und Türöffneranlage |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7809541L true SE7809541L (sv) | 1979-03-14 |
SE427232B SE427232B (sv) | 1983-03-14 |
Family
ID=6018834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7809541A SE427232B (sv) | 1977-09-13 | 1978-09-11 | Kopplingsanordning for en anrops-, porttelefon- och portoppningsanleggning |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE870388R (sv) |
CH (1) | CH632623A5 (sv) |
DE (1) | DE2741160C2 (sv) |
FR (1) | FR2402978A2 (sv) |
NL (1) | NL7808822A (sv) |
SE (1) | SE427232B (sv) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1165528B (it) * | 1980-12-15 | 1987-04-22 | Urmet Spa | Impianto citofonico con trasmissione di immagine impiegantte quattro conduttori comuni ed un conduttore di selezione per ciascun posto interno |
DE4130101C1 (en) * | 1991-09-11 | 1993-02-04 | Ritto-Werk Loh Gmbh & Co Kg, 6342 Haiger, De | Door intercom with door-opening button - centrally generates call signal and feeds to individual internal intercoms using circuit including two series-connected Zener diodes and parallel decoupling diode |
-
1977
- 1977-09-13 DE DE2741160A patent/DE2741160C2/de not_active Expired
-
1978
- 1978-08-25 NL NL7808822A patent/NL7808822A/xx not_active Application Discontinuation
- 1978-09-11 SE SE7809541A patent/SE427232B/sv unknown
- 1978-09-12 FR FR7826196A patent/FR2402978A2/fr active Pending
- 1978-09-12 BE BE2057265A patent/BE870388R/xx not_active IP Right Cessation
- 1978-09-12 CH CH956078A patent/CH632623A5/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE427232B (sv) | 1983-03-14 |
NL7808822A (nl) | 1979-03-15 |
BE870388R (nl) | 1979-01-02 |
CH632623A5 (en) | 1982-10-15 |
DE2741160A1 (de) | 1979-04-12 |
FR2402978A2 (fr) | 1979-04-06 |
DE2741160C2 (de) | 1985-05-09 |
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