BE363032A - - Google Patents
Info
- Publication number
- BE363032A BE363032A BE363032DA BE363032A BE 363032 A BE363032 A BE 363032A BE 363032D A BE363032D A BE 363032DA BE 363032 A BE363032 A BE 363032A
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1944283X | 1929-06-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE363032A true BE363032A (de) |
Family
ID=7750643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE363032D BE363032A (de) | 1929-06-22 |
Country Status (3)
Country | Link |
---|---|
US (1) | US1944283A (de) |
BE (1) | BE363032A (de) |
FR (1) | FR680306A (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR948355A (fr) * | 1942-12-31 | 1949-07-29 | Western Electric Co | Dispositif de couplage utilisables dans les systèmes de transmission d'ondes |
US3135829A (en) * | 1959-10-09 | 1964-06-02 | Itt | Conference call circuit |
US3891801A (en) * | 1974-01-21 | 1975-06-24 | Quindar Electronics | Four-way four-wire active bridge |
US3885100A (en) * | 1974-05-31 | 1975-05-20 | Bell Telephone Labor Inc | Six-port conference amplifier circuit |
US4008376A (en) * | 1975-10-17 | 1977-02-15 | Bell Telephone Laboratories, Incorporated | Loudspeaking teleconferencing circuit |
US4289932A (en) * | 1979-10-15 | 1981-09-15 | Reed Roger R | Conferencing communications system |
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0
- BE BE363032D patent/BE363032A/xx unknown
- FR FR680306D patent/FR680306A/fr not_active Expired
-
1930
- 1930-05-31 US US458441A patent/US1944283A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR680306A (de) | 1930-04-26 |
US1944283A (en) | 1934-01-23 |