BE438929A - - Google Patents
Info
- Publication number
- BE438929A BE438929A BE438929DA BE438929A BE 438929 A BE438929 A BE 438929A BE 438929D A BE438929D A BE 438929DA BE 438929 A BE438929 A BE 438929A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL865496X | 1939-05-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE438929A true BE438929A (en:Method) |
Family
ID=19849261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE438929D BE438929A (en:Method) | 1939-05-09 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE438929A (en:Method) |
| DE (1) | DE726437C (en:Method) |
| FR (1) | FR865496A (en:Method) |
| NL (1) | NL54610C (en:Method) |
-
0
- NL NL54610D patent/NL54610C/xx active
- BE BE438929D patent/BE438929A/xx unknown
-
1940
- 1940-05-08 FR FR865496D patent/FR865496A/fr not_active Expired
- 1940-05-16 DE DEP80779D patent/DE726437C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR865496A (fr) | 1941-05-24 |
| NL54610C (en:Method) | |
| DE726437C (de) | 1942-10-14 |