FR743454A - - Google Patents
Info
- Publication number
- FR743454A FR743454A FR743454DA FR743454A FR 743454 A FR743454 A FR 743454A FR 743454D A FR743454D A FR 743454DA FR 743454 A FR743454 A FR 743454A
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
- H04M1/667—Preventing unauthorised calls from a telephone set
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR743454A true FR743454A (da) | 1933-03-31 |
Family
ID=1547709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR743454D Expired FR743454A (da) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR743454A (da) |
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0
- FR FR743454D patent/FR743454A/fr not_active Expired