BE431728A - - Google Patents
Info
- Publication number
- BE431728A BE431728A BE431728DA BE431728A BE 431728 A BE431728 A BE 431728A BE 431728D A BE431728D A BE 431728DA BE 431728 A BE431728 A BE 431728A
- 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)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH214506T | 1938-12-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE431728A true BE431728A (pt) |
Family
ID=4448728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE431728D BE431728A (pt) | 1938-12-20 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE431728A (pt) |
| CH (1) | CH214506A (pt) |
-
0
- BE BE431728D patent/BE431728A/xx unknown
-
1938
- 1938-12-20 CH CH214506D patent/CH214506A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH214506A (fr) | 1941-04-30 |