ES450594A1 - Un montaje para la seleccion directa de estaciones telefoni-cas. - Google Patents
Un montaje para la seleccion directa de estaciones telefoni-cas.Info
- Publication number
- ES450594A1 ES450594A1 ES450594A ES450594A ES450594A1 ES 450594 A1 ES450594 A1 ES 450594A1 ES 450594 A ES450594 A ES 450594A ES 450594 A ES450594 A ES 450594A ES 450594 A1 ES450594 A1 ES 450594A1
- Authority
- ES
- Spain
- Prior art keywords
- station
- telephone
- selection circuit
- station selection
- direct
- Prior art date
- 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
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
- H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/603,327 US4032724A (en) | 1975-08-11 | 1975-08-11 | Direct station selection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
ES450594A1 true ES450594A1 (es) | 1977-09-16 |
Family
ID=24414961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES450594A Expired ES450594A1 (es) | 1975-08-11 | 1976-08-10 | Un montaje para la seleccion directa de estaciones telefoni-cas. |
Country Status (2)
Country | Link |
---|---|
US (1) | US4032724A (es) |
ES (1) | ES450594A1 (es) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5247305A (en) * | 1975-10-13 | 1977-04-15 | Iwatsu Electric Co Ltd | Extension calling systemof button telephone system |
US4081614A (en) * | 1977-04-14 | 1978-03-28 | Rauland-Borg Corporation | Supervised single link telephone system |
US4280022A (en) * | 1978-02-07 | 1981-07-21 | Iwasaki Tsushinki Kabushiki Kaisha | Key telephone systems |
US4665545A (en) * | 1985-05-14 | 1987-05-12 | American Telephone And Telegraph Company | Communication system having multi-mode line selection buttons |
US4823377A (en) * | 1986-10-29 | 1989-04-18 | Tamura Electric Works, Ltd. | System for setting registration mode for key telephone set |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3210475A (en) * | 1961-06-08 | 1965-10-05 | Bell Telephone Labor Inc | Direct station selection circuit |
US3299217A (en) * | 1963-10-31 | 1967-01-17 | Bell Telephone Labor Inc | Auxiliary interconnecting unit for multi-line subscriber telephone system |
US3725601A (en) * | 1971-03-05 | 1973-04-03 | Bell Telephone Labor Inc | Direct station selection private intercom exchange system |
US3819871A (en) * | 1972-05-30 | 1974-06-25 | Electronique Appliquee | Telephone switching and intercom equipment |
JPS539804B2 (es) * | 1973-02-10 | 1978-04-08 | ||
US3872261A (en) * | 1973-04-05 | 1975-03-18 | Nitsuko Ltd | Switching apparatus for use in a paging system of a key telephone system |
GB1480221A (en) * | 1973-10-26 | 1977-07-20 | Gte International Inc | Telephone intercommunication systems |
-
1975
- 1975-08-11 US US05/603,327 patent/US4032724A/en not_active Expired - Lifetime
-
1976
- 1976-08-10 ES ES450594A patent/ES450594A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US4032724A (en) | 1977-06-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FD1A | Patent lapsed |
Effective date: 19970612 |