BE356540A - - Google Patents
Info
- Publication number
- BE356540A BE356540A BE356540DA BE356540A BE 356540 A BE356540 A BE 356540A BE 356540D A BE356540D A BE 356540DA BE 356540 A BE356540 A BE 356540A
- 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1795494X | 1927-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE356540A true BE356540A (en:Method) |
Family
ID=7743641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE356540D BE356540A (en:Method) | 1927-12-15 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1795494A (en:Method) |
| BE (1) | BE356540A (en:Method) |
| FR (1) | FR665579A (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2580709A (en) * | 1947-11-14 | 1952-01-01 | Automatic Elect Lab | Toll switching telephone system having automatic amplifier insertion and gain setting |
-
0
- BE BE356540D patent/BE356540A/xx unknown
-
1928
- 1928-12-12 FR FR665579D patent/FR665579A/fr not_active Expired
- 1928-12-12 US US325534A patent/US1795494A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US1795494A (en) | 1931-03-10 |
| FR665579A (fr) | 1929-09-20 |