BE717147A - - Google Patents
Info
- Publication number
- BE717147A BE717147A BE717147DA BE717147A BE 717147 A BE717147 A BE 717147A BE 717147D A BE717147D A BE 717147DA BE 717147 A BE717147 A BE 717147A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/38—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT5224467 | 1967-06-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE717147A true BE717147A (en:Method) | 1968-12-02 |
Family
ID=32923002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE717147D BE717147A (en:Method) | 1967-06-27 | 1968-06-26 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3569634A (en:Method) |
| BE (1) | BE717147A (en:Method) |
| DE (1) | DE1762452A1 (en:Method) |
| FR (1) | FR1581607A (en:Method) |
| GB (1) | GB1220958A (en:Method) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA907188A (en) * | 1970-04-27 | 1972-08-08 | Ronald C. B. Smith | Electronic telephone call restricting device |
| CH537677A (it) * | 1970-10-06 | 1973-05-31 | It Telecommunicazioni Siemens | Dispositivo di blocco alla teleselezione e ai servizi tassati in generale per apparecchi telefonici d'utente |
| CH541263A (it) * | 1970-11-09 | 1973-08-31 | Sits Soc It Telecom Siemens | Dispositivo di blocco alla teleselezione e ai servizi tassati per apparecchi telefonici allacciati a centralini telefonici privati |
| US3784757A (en) * | 1971-06-14 | 1974-01-08 | Information Flow Inc | Limited access dialing system |
| US3872260A (en) * | 1972-08-10 | 1975-03-18 | Telephonic Equipment Corp | Toll call prohibitor |
| US3851109A (en) * | 1973-05-03 | 1974-11-26 | R Downs | Telephone control system |
| US4008379A (en) * | 1975-02-14 | 1977-02-15 | San/Bar Corporation | Touch-pad to dial conversion unit |
| US4284851A (en) * | 1979-06-29 | 1981-08-18 | Bell Telephone Laboratories, Incorporated | Arrangement for frustrating fraudulent telephone calls |
| US4358640A (en) | 1980-11-25 | 1982-11-09 | Murray Leonard Q | Telephone security device |
| DE3622712A1 (de) * | 1986-07-05 | 1988-01-21 | Neumann Elektronik Gmbh | Verfahren zur sperrung einer fernsprecheinrichtung fuer abgehende gespraeche in fernsprechanlagen mit impuls- und/oder frequenzwahl sowie waehlsperre zur durchfuehrung des verfahrens |
| JPH1198270A (ja) * | 1997-09-19 | 1999-04-09 | Fujitsu Ltd | 通信支援装置 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE522252A (en:Method) * | 1952-08-23 | |||
| US2914616A (en) * | 1955-06-30 | 1959-11-24 | Gen Telephone Lab Inc | Restricted service arrangements in telephone systems |
-
1968
- 1968-06-19 US US738172A patent/US3569634A/en not_active Expired - Lifetime
- 1968-06-20 DE DE19681762452 patent/DE1762452A1/de active Pending
- 1968-06-21 GB GB29792/68A patent/GB1220958A/en not_active Expired
- 1968-06-26 BE BE717147D patent/BE717147A/xx unknown
- 1968-06-27 FR FR1581607D patent/FR1581607A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3569634A (en) | 1971-03-09 |
| GB1220958A (en) | 1971-01-27 |
| DE1762452A1 (de) | 1971-01-28 |
| FR1581607A (en:Method) | 1969-09-19 |