BE501722A - - Google Patents
Info
- Publication number
- BE501722A BE501722A BE501722DA BE501722A BE 501722 A BE501722 A BE 501722A BE 501722D A BE501722D A BE 501722DA BE 501722 A BE501722 A BE 501722A
- 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)
- Noise Elimination (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB297999X | 1950-03-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE501722A true BE501722A (it) |
Family
ID=10297349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE501722D BE501722A (it) | 1950-03-08 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2686227A (it) |
| BE (1) | BE501722A (it) |
| CH (1) | CH297999A (it) |
| FR (1) | FR1042770A (it) |
| GB (1) | GB691741A (it) |
| NL (2) | NL84411C (it) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2749390A (en) * | 1952-12-02 | 1956-06-05 | Itt | Ringing circuit for telephone line and radio order wire |
| FR1096599A (fr) * | 1953-12-22 | 1955-06-22 | Lignes Telegraph Telephon | Dispositif comportant des éléments non linéaires associés à des circuits sélectifs |
| US2806903A (en) * | 1954-03-24 | 1957-09-17 | Int Standard Electric Corp | Voice frequency signal receivers |
| US2957950A (en) * | 1954-11-18 | 1960-10-25 | Bell Telephone Labor Inc | Transistor selective ringing circuit |
| US2955161A (en) * | 1956-06-29 | 1960-10-04 | Automatic Elect Lab | Tone detector for coin control |
| US2939919A (en) * | 1958-04-17 | 1960-06-07 | Bell Telephone Labor Inc | Subscriber ringing in carrier telephone systems |
| GB946952A (en) * | 1961-06-14 | 1964-01-15 | Ass Elect Ind | Improvements relating to voice-frequency signal receivers as used in telephone systems |
| DE1146137B (de) * | 1961-11-16 | 1963-03-28 | Standard Elektrik Lorenz Ag | Tonfrequenzsignalempfaenger mit Sprachsperre |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2145053A (en) * | 1936-11-18 | 1939-01-24 | Bell Telephone Labor Inc | Signaling system |
| US2282131A (en) * | 1940-01-12 | 1942-05-05 | Associated Electric Lab Inc | Electrical signaling system |
| GB541731A (en) * | 1940-06-07 | 1941-12-09 | Telephone Mfg Co Ltd | Improvements in and relating to telephone and like systems |
-
0
- NL NL159620D patent/NL159620C/xx active
- NL NL84411D patent/NL84411C/xx active
- BE BE501722D patent/BE501722A/xx unknown
-
1950
- 1950-03-08 GB GB5874/50A patent/GB691741A/en not_active Expired
-
1951
- 1951-03-05 US US213965A patent/US2686227A/en not_active Expired - Lifetime
- 1951-03-07 FR FR1042770D patent/FR1042770A/fr not_active Expired
- 1951-03-07 CH CH297999D patent/CH297999A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US2686227A (en) | 1954-08-10 |
| CH297999A (de) | 1954-04-15 |
| NL84411C (it) | |
| GB691741A (en) | 1953-05-20 |
| FR1042770A (fr) | 1953-11-03 |
| NL159620C (it) |