CH578809A5 - - Google Patents
Info
- Publication number
- CH578809A5 CH578809A5 CH1311373A CH1311373A CH578809A5 CH 578809 A5 CH578809 A5 CH 578809A5 CH 1311373 A CH1311373 A CH 1311373A CH 1311373 A CH1311373 A CH 1311373A CH 578809 A5 CH578809 A5 CH 578809A5
- Authority
- CH
- Switzerland
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
-
- 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
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
- Input From Keyboards Or The Like (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7233529A FR2199921A5 (en(2012)) | 1972-09-21 | 1972-09-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH578809A5 true CH578809A5 (en(2012)) | 1976-08-13 |
Family
ID=9104608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH1311373A CH578809A5 (en(2012)) | 1972-09-21 | 1973-09-11 |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE804753A (en(2012)) |
| CH (1) | CH578809A5 (en(2012)) |
| DE (1) | DE2345757A1 (en(2012)) |
| FR (1) | FR2199921A5 (en(2012)) |
| GB (1) | GB1423668A (en(2012)) |
| IT (1) | IT993358B (en(2012)) |
| NL (1) | NL7313088A (en(2012)) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3036801C2 (de) * | 1980-09-30 | 1982-08-26 | Ritto-Werk Loh GmbH & Co KG, 6348 Herborn | Schaltungsanordnung zur Übertragung von Gleichstrom-Kennzeichen über eine zweiradrige Leitung von einer Sendestelle zu einer Empfangsstelle, insbesondere von einer Sprechstelle zu der Zentrale einer Sprechanlage |
| GB8614199D0 (en) * | 1986-06-11 | 1986-07-16 | Salplex Ltd | Information handling & control systems |
-
1972
- 1972-09-21 FR FR7233529A patent/FR2199921A5/fr not_active Expired
-
1973
- 1973-09-11 DE DE19732345757 patent/DE2345757A1/de active Pending
- 1973-09-11 CH CH1311373A patent/CH578809A5/xx not_active IP Right Cessation
- 1973-09-12 BE BE1005356A patent/BE804753A/xx unknown
- 1973-09-20 GB GB4425273A patent/GB1423668A/en not_active Expired
- 1973-09-21 IT IT2922873A patent/IT993358B/it active
- 1973-09-21 NL NL7313088A patent/NL7313088A/xx not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2199921A5 (en(2012)) | 1974-04-12 |
| DE2345757A1 (de) | 1974-03-28 |
| IT993358B (it) | 1975-09-30 |
| NL7313088A (en(2012)) | 1974-03-25 |
| BE804753A (fr) | 1974-03-12 |
| GB1423668A (en) | 1976-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased | ||
| PL | Patent ceased |