BE512819A - - Google Patents
Info
- Publication number
- BE512819A BE512819A BE512819DA BE512819A BE 512819 A BE512819 A BE 512819A BE 512819D A BE512819D A BE 512819DA BE 512819 A BE512819 A BE 512819A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT314171X | 1951-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE512819A true BE512819A (en:Method) |
Family
ID=11233607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE512819D BE512819A (en:Method) | 1951-07-14 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE512819A (en:Method) |
| CH (1) | CH314171A (en:Method) |
| FR (1) | FR1067890A (en:Method) |
-
0
- BE BE512819D patent/BE512819A/xx unknown
-
1952
- 1952-07-09 CH CH314171D patent/CH314171A/it unknown
- 1952-07-11 FR FR1067890D patent/FR1067890A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH314171A (it) | 1956-05-31 |
| FR1067890A (fr) | 1954-06-21 |