BE571915A - - Google Patents
Info
- Publication number
- BE571915A BE571915A BE571915DA BE571915A BE 571915 A BE571915 A BE 571915A BE 571915D A BE571915D A BE 571915DA BE 571915 A BE571915 A BE 571915A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
-
- 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
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
-
- 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
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE920657 | 1957-10-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE571915A true BE571915A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Family
ID=20276115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE571915D BE571915A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1957-10-10 |
Country Status (4)
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1092065B (de) * | 1958-10-13 | 1960-11-03 | Hermann Wetzer K G | Vorrichtung zur magnetischen Aufnahme und Wiedergabe von Waehlimpulsen |
| JPS5340824A (en) * | 1976-09-27 | 1978-04-13 | Hitachi Ltd | Combining circuit |
| FR2653123B1 (fr) * | 1989-10-17 | 1992-01-17 | Roussel Uclaf | Nouveaux derives de la pyridone, leur procede de preparation, les nouveaux intermediaires obtenus, leur application a titre de medicaments et les compositions pharmaceutiques les renfermant. |
| GB2324006B (en) * | 1997-04-02 | 2001-08-22 | David Williams | Electronic modulation scheme |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2232398A (en) * | 1939-11-28 | 1941-02-18 | Bell Telephone Labor Inc | Telephone substation circuit |
| US2554201A (en) * | 1946-06-19 | 1951-05-22 | Ericsson Telefon Ab L M | Key-sending automatic telephone signaling system |
| US2717280A (en) * | 1954-03-01 | 1955-09-06 | Bell Telephone Labor Inc | Signaling or dialing system |
| US2875281A (en) * | 1954-03-08 | 1959-02-24 | Bell Telephone Labor Inc | Telephone ringing system |
-
0
- BE BE571915D patent/BE571915A/xx unknown
-
1958
- 1958-10-03 GB GB31669/58A patent/GB890860A/en not_active Expired
- 1958-10-09 CH CH6485358A patent/CH372351A/de unknown
- 1958-10-10 US US766432A patent/US3055986A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CH372351A (de) | 1963-10-15 |
| GB890860A (en) | 1962-03-07 |
| US3055986A (en) | 1962-09-25 |