BE499462A - - Google Patents
Info
- Publication number
- BE499462A BE499462A BE499462DA BE499462A BE 499462 A BE499462 A BE 499462A BE 499462D A BE499462D A BE 499462DA BE 499462 A BE499462 A BE 499462A
- 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)
- Radio Relay Systems (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US128777A US2589113A (en) | 1949-11-22 | 1949-11-22 | Frequency modulated tone units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE499462A true BE499462A (it) |
Family
ID=22436928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE499462D BE499462A (it) | 1949-11-22 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2589113A (it) |
| BE (1) | BE499462A (it) |
| GB (1) | GB687087A (it) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2155176A (en) * | 1936-11-07 | 1939-04-18 | Associated Electric Lab Inc | Telephone system |
| BE424612A (it) * | 1936-11-14 | |||
| US2482478A (en) * | 1947-03-29 | 1949-09-20 | Automatic Elect Lab | Tone unit |
-
0
- BE BE499462D patent/BE499462A/xx unknown
-
1949
- 1949-11-22 US US128777A patent/US2589113A/en not_active Expired - Lifetime
-
1950
- 1950-11-02 GB GB26794/50A patent/GB687087A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2589113A (en) | 1952-03-11 |
| GB687087A (en) | 1953-02-04 |