IT969631B - Dispositivo elettronico di modula zione di corrente in particolare di tonalita di falsa chiamata - Google Patents
Dispositivo elettronico di modula zione di corrente in particolare di tonalita di falsa chiamataInfo
- Publication number
- IT969631B IT969631B IT3057972A IT3057972A IT969631B IT 969631 B IT969631 B IT 969631B IT 3057972 A IT3057972 A IT 3057972A IT 3057972 A IT3057972 A IT 3057972A IT 969631 B IT969631 B IT 969631B
- Authority
- IT
- Italy
- Prior art keywords
- modulation device
- current modulation
- electronic current
- particular shade
- false call
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7137681A FR2157159A5 (enrdf_load_stackoverflow) | 1971-10-20 | 1971-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT969631B true IT969631B (it) | 1974-04-10 |
Family
ID=9084647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT3057972A IT969631B (it) | 1971-10-20 | 1972-10-18 | Dispositivo elettronico di modula zione di corrente in particolare di tonalita di falsa chiamata |
Country Status (8)
| Country | Link |
|---|---|
| BE (1) | BE789970A (enrdf_load_stackoverflow) |
| CH (1) | CH565488A5 (enrdf_load_stackoverflow) |
| DE (1) | DE2250647A1 (enrdf_load_stackoverflow) |
| FR (1) | FR2157159A5 (enrdf_load_stackoverflow) |
| GB (1) | GB1413312A (enrdf_load_stackoverflow) |
| IT (1) | IT969631B (enrdf_load_stackoverflow) |
| NL (1) | NL7214189A (enrdf_load_stackoverflow) |
| SE (1) | SE389251B (enrdf_load_stackoverflow) |
-
0
- BE BE789970D patent/BE789970A/xx unknown
-
1971
- 1971-10-20 FR FR7137681A patent/FR2157159A5/fr not_active Expired
-
1972
- 1972-10-09 CH CH1483772A patent/CH565488A5/xx not_active IP Right Cessation
- 1972-10-16 DE DE19722250647 patent/DE2250647A1/de active Pending
- 1972-10-18 IT IT3057972A patent/IT969631B/it active
- 1972-10-19 SE SE1348872A patent/SE389251B/xx unknown
- 1972-10-20 GB GB4832272A patent/GB1413312A/en not_active Expired
- 1972-10-20 NL NL7214189A patent/NL7214189A/xx not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2157159A5 (enrdf_load_stackoverflow) | 1973-06-01 |
| SE389251B (sv) | 1976-10-25 |
| DE2250647A1 (de) | 1973-04-26 |
| CH565488A5 (enrdf_load_stackoverflow) | 1975-08-15 |
| GB1413312A (en) | 1975-11-12 |
| NL7214189A (enrdf_load_stackoverflow) | 1973-04-25 |
| BE789970A (fr) | 1973-04-12 |
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