BE559459A - - Google Patents
Info
- Publication number
- BE559459A BE559459A BE559459DA BE559459A BE 559459 A BE559459 A BE 559459A BE 559459D A BE559459D A BE 559459DA BE 559459 A BE559459 A BE 559459A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
-
- 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)
- Signal Processing (AREA)
- Multimedia (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US608132A US2912503A (en) | 1956-09-05 | 1956-09-05 | Electronic conference circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE559459A true BE559459A (xx) |
Family
ID=24435179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE559459D BE559459A (xx) | 1956-09-05 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2912503A (xx) |
| BE (1) | BE559459A (xx) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3135829A (en) * | 1959-10-09 | 1964-06-02 | Itt | Conference call circuit |
| US3264411A (en) * | 1963-04-05 | 1966-08-02 | Reaves Michael John | Telephone conference systems |
| US3524929A (en) * | 1967-06-29 | 1970-08-18 | Automatic Elect Lab | Telephone conference circuit |
| US3703610A (en) * | 1970-08-21 | 1972-11-21 | Bell Telephone Labor Inc | Party-line bridge-lifter |
| US3818139A (en) * | 1971-10-22 | 1974-06-18 | R Snyder | Multipath conference system with switching |
| US3870819A (en) * | 1973-12-26 | 1975-03-11 | Roderick A Dennis | Conference call apparatus for use with key telephone system equipment |
| US4682348A (en) * | 1985-05-16 | 1987-07-21 | Emhart Industries, Inc. | Life safety audio system having a voice synthesizer and a constant volume telephone network |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2279660A (en) * | 1937-04-13 | 1942-04-14 | Rca Corp | Wave length modulation system |
| US2523671A (en) * | 1949-01-25 | 1950-09-26 | Talk O Products Inc | Intercommunicating system |
-
0
- BE BE559459D patent/BE559459A/xx unknown
-
1956
- 1956-09-05 US US608132A patent/US2912503A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2912503A (en) | 1959-11-10 |