BE629372A - - Google Patents
Info
- Publication number
- BE629372A BE629372A BE629372DA BE629372A BE 629372 A BE629372 A BE 629372A BE 629372D A BE629372D A BE 629372DA BE 629372 A BE629372 A BE 629372A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US178329A US3133994A (en) | 1962-03-08 | 1962-03-08 | Conference circuit for telephone switching systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE629372A true BE629372A (US07217764-20070515-C00014.png) |
Family
ID=22652117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE629372D BE629372A (US07217764-20070515-C00014.png) | 1962-03-08 |
Country Status (8)
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE641512A (US07217764-20070515-C00014.png) * | 1962-03-22 | |||
| US3301962A (en) * | 1963-04-29 | 1967-01-31 | Bell Telephone Labor Inc | Directional conference system |
| US3322901A (en) * | 1964-03-31 | 1967-05-30 | American Telephone & Telegraph | Pbx dial conference trunk circuit |
| US3377433A (en) * | 1964-12-02 | 1968-04-09 | Bell Telephone Labor Inc | Switching system arrangement for providing multiple switching network line appearances without preassignment |
| US3496303A (en) * | 1966-10-18 | 1970-02-17 | Stromberg Carlson Corp | Universal junctor with special features trunk |
| US3504130A (en) * | 1966-10-24 | 1970-03-31 | Bell Telephone Labor Inc | Switching system for establishing conference connections |
| US3527889A (en) * | 1967-03-01 | 1970-09-08 | New North Electric Co | Conference communication system |
| BE791688A (fr) * | 1971-11-24 | 1973-03-16 | Western Electric Co | Montage pour systeme d'autocommutateur prive |
| GB1602474A (en) | 1977-10-06 | 1981-11-11 | Warman B J | Device for establishing conference calls via at least one telephone exchange switching system |
| FR2592541B1 (fr) * | 1985-12-31 | 1991-10-11 | Leroy Alain | Terminal telephonique de teleconference. |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1074665B (de) * | 1960-02-04 | Standard Elektrik Lorenz Aktiengesellschaft, Stuttgart-Zuffenhausen | Schaltungsanordnung für eine Konferenzeinrichtung in Fernsprechnebenstellenanlagen | |
| DE414609C (de) * | 1921-02-05 | 1925-06-06 | Automatic Electric Co | Schaltungsanordnung fuer Fernsprechanlagen mit Einrichtungen zur Fuehrung von Gruppengespraechen |
| DE561531C (de) * | 1928-10-03 | 1932-10-15 | Hans Decker Dr | Schaltungsanordnung zur Abhaltung von Konferenzgespraechen |
| DE606861C (de) * | 1932-12-28 | 1934-12-13 | Mix & Genest Akt Ges | Schaltungsanordnung fuer Konferenz-Fernsprechanlagen mit Nachbildung des Konferenznetzes |
| US2154379A (en) * | 1936-05-23 | 1939-04-11 | Western Union Telegraph Co | Method of and apparatus for testing relays |
| DE872372C (de) * | 1943-10-24 | 1953-03-30 | Siemens Ag | Fernkonferenzschaltung ueber Fernleitungen mit einer beliebigen Zahl von Teilnehmern |
| US2894074A (en) * | 1955-02-25 | 1959-07-07 | Gen Dynamics Corp | Telephone conference circuit |
| US2912523A (en) * | 1955-10-26 | 1959-11-10 | Industrial Res Prod Inc | Electro-acoustic transducer |
| US2848548A (en) * | 1955-12-01 | 1958-08-19 | Gen Dynamics Corp | Conference circuit |
| US2975237A (en) * | 1959-12-23 | 1961-03-14 | Bell Telephone Labor Inc | Telephone conference circuit |
-
0
- BE BE629372D patent/BE629372A/xx unknown
- NL NL289144D patent/NL289144A/xx unknown
-
1962
- 1962-03-08 US US178329A patent/US3133994A/en not_active Expired - Lifetime
-
1963
- 1963-02-07 GB GB4974/63A patent/GB973478A/en not_active Expired
- 1963-02-20 DE DEW33940A patent/DE1273596B/de not_active Withdrawn
- 1963-02-22 JP JP772163A patent/JPS408564B1/ja active Pending
- 1963-03-04 FR FR926729A patent/FR1353732A/fr not_active Expired
- 1963-03-08 SE SE2588/63A patent/SE314414B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL289144A (US07217764-20070515-C00014.png) | |
| SE314414B (US07217764-20070515-C00014.png) | 1969-09-08 |
| FR1353732A (fr) | 1964-02-28 |
| JPS408564B1 (US07217764-20070515-C00014.png) | 1965-05-04 |
| US3133994A (en) | 1964-05-19 |
| GB973478A (en) | 1964-10-28 |
| DE1273596B (de) | 1968-07-25 |
