BE393590A - - Google Patents
Info
- Publication number
- BE393590A BE393590A BE393590DA BE393590A BE 393590 A BE393590 A BE 393590A BE 393590D A BE393590D A BE 393590DA BE 393590 A BE393590 A BE 393590A
- 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE748752X | 1932-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE393590A true BE393590A (en:Method) |
Family
ID=6649049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE393590D BE393590A (en:Method) | 1932-01-09 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE393590A (en:Method) |
| FR (1) | FR748752A (en:Method) |
-
0
- BE BE393590D patent/BE393590A/xx unknown
-
1933
- 1933-01-09 FR FR748752D patent/FR748752A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR748752A (fr) | 1933-07-08 |