BE519608A - - Google Patents
Info
- Publication number
- BE519608A BE519608A BE519608DA BE519608A BE 519608 A BE519608 A BE 519608A BE 519608D A BE519608D A BE 519608DA BE 519608 A BE519608 A BE 519608A
- Authority
- BE
- Belgium
Links
Classifications
-
- 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
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US285354A US2642500A (en) | 1952-05-01 | 1952-05-01 | Voice frequency signaling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE519608A true BE519608A (US20100029827A1-20100204-C00018.png) |
Family
ID=23093870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE519608D BE519608A (US20100029827A1-20100204-C00018.png) | 1952-05-01 |
Country Status (6)
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2957950A (en) * | 1954-11-18 | 1960-10-25 | Bell Telephone Labor Inc | Transistor selective ringing circuit |
| US2814674A (en) * | 1954-11-23 | 1957-11-26 | Siemens Edison Swan Ltd | Telephone trunk supervisory signalling system |
| BE565636A (US20100029827A1-20100204-C00018.png) * | 1957-03-14 |
-
0
- BE BE519608D patent/BE519608A/xx unknown
- NL NL100869D patent/NL100869C/xx active
-
1952
- 1952-05-01 US US285354A patent/US2642500A/en not_active Expired - Lifetime
-
1953
- 1953-01-09 FR FR1072624D patent/FR1072624A/fr not_active Expired
- 1953-04-30 CH CH316979D patent/CH316979A/de unknown
- 1953-05-01 GB GB12119/53A patent/GB729261A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB729261A (en) | 1955-05-04 |
| NL100869C (US20100029827A1-20100204-C00018.png) | |
| CH316979A (de) | 1956-10-31 |
| US2642500A (en) | 1953-06-16 |
| FR1072624A (fr) | 1954-09-14 |
