BE362519A - - Google Patents
Info
- Publication number
- BE362519A BE362519A BE362519DA BE362519A BE 362519 A BE362519 A BE 362519A BE 362519D A BE362519D A BE 362519DA BE 362519 A BE362519 A BE 362519A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB21064/28A GB324328A (en) | 1928-07-20 | 1928-07-20 | Improvements in telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE362519A true BE362519A (zh) |
Family
ID=10156588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE362519D BE362519A (zh) | 1928-07-20 |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US1763013A (zh) |
| BE (1) | BE362519A (zh) |
| DE (1) | DE636403C (zh) |
| FR (1) | FR680025A (zh) |
| GB (1) | GB324328A (zh) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2601302A (en) * | 1941-05-02 | 1952-06-24 | Int Standard Electric Corp | Two-way wire telephone repeater circuit |
| US2564084A (en) * | 1946-11-02 | 1951-08-14 | Automatic Elect Lab | Telephone system having repeater insertion on long distance lines |
| US2550755A (en) * | 1947-09-24 | 1951-05-01 | Automatic Elect Lab | Toll switching telephone system |
-
0
- BE BE362519D patent/BE362519A/xx unknown
- US US19741D patent/USRE19741E/en not_active Expired
-
1928
- 1928-07-20 GB GB21064/28A patent/GB324328A/en not_active Expired
-
1929
- 1929-07-03 US US375715A patent/US1763013A/en not_active Expired - Lifetime
- 1929-07-18 FR FR680025D patent/FR680025A/fr not_active Expired
- 1929-07-19 DE DEI38724D patent/DE636403C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| USRE19741E (en) | 1935-10-22 |
| DE636403C (de) | 1936-10-13 |
| GB324328A (en) | 1930-01-20 |
| FR680025A (fr) | 1930-04-24 |
| US1763013A (en) | 1930-06-10 |