NL7303140A - - Google Patents
Info
- Publication number
- NL7303140A NL7303140A NL7303140A NL7303140A NL7303140A NL 7303140 A NL7303140 A NL 7303140A NL 7303140 A NL7303140 A NL 7303140A NL 7303140 A NL7303140 A NL 7303140A NL 7303140 A NL7303140 A NL 7303140A
- Authority
- NL
- Netherlands
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 |
|---|---|---|---|
| DE19722210835 DE2210835C3 (de) | 1972-03-07 | 1972-03-07 | Schaltungsanordnung für Türsprechanlagen mit selbsttätigem, sprachgesteuertem Gegensprech- oder Semi-Duplex-Verstärker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL7303140A true NL7303140A (enExample) | 1973-09-11 |
Family
ID=5838113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL7303140A NL7303140A (enExample) | 1972-03-07 | 1973-03-06 |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH550522A (enExample) |
| DE (1) | DE2210835C3 (enExample) |
| FR (1) | FR2174856B3 (enExample) |
| NL (1) | NL7303140A (enExample) |
| SE (1) | SE401071B (enExample) |
-
1972
- 1972-03-07 DE DE19722210835 patent/DE2210835C3/de not_active Expired
-
1973
- 1973-01-25 CH CH102973A patent/CH550522A/xx not_active IP Right Cessation
- 1973-02-21 FR FR7306161A patent/FR2174856B3/fr not_active Expired
- 1973-03-05 SE SE7303058A patent/SE401071B/xx unknown
- 1973-03-06 NL NL7303140A patent/NL7303140A/xx not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2210835C3 (de) | 1978-08-03 |
| FR2174856B3 (enExample) | 1976-02-20 |
| SE401071B (sv) | 1978-04-17 |
| FR2174856A1 (enExample) | 1973-10-19 |
| DE2210835A1 (de) | 1973-09-20 |
| CH550522A (de) | 1974-06-14 |
| DE2210835B2 (de) | 1977-12-15 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| BA | A request for search or an international-type search has been filed | ||
| BB | A search report has been drawn up | ||
| BV | The patent application has lapsed |