BE355834A - - Google Patents
Info
- Publication number
- BE355834A BE355834A BE355834DA BE355834A BE 355834 A BE355834 A BE 355834A BE 355834D A BE355834D A BE 355834DA BE 355834 A BE355834 A BE 355834A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Audible And Visible Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE664025X | 1928-08-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE355834A true BE355834A (en:Method) |
Family
ID=6589354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE355834D BE355834A (en:Method) | 1928-08-21 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE355834A (en:Method) |
| FR (1) | FR664025A (en:Method) |
| GB (1) | GB300586A (en:Method) |
-
0
- BE BE355834D patent/BE355834A/xx unknown
-
1928
- 1928-11-14 GB GB33392/28A patent/GB300586A/en not_active Expired
- 1928-11-15 FR FR664025D patent/FR664025A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR664025A (fr) | 1929-08-28 |
| GB300586A (en:Method) | 1929-07-04 |