JPS553880B1 - - Google Patents
Info
- Publication number
- JPS553880B1 JPS553880B1 JP10328771A JP10328771A JPS553880B1 JP S553880 B1 JPS553880 B1 JP S553880B1 JP 10328771 A JP10328771 A JP 10328771A JP 10328771 A JP10328771 A JP 10328771A JP S553880 B1 JPS553880 B1 JP S553880B1
- Authority
- JP
- Japan
- 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.)
- Pending
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
- H04M9/007—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 wherein the key telephone sets are star-connected to a central unit by a limited number of lines
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10020270A | 1970-12-21 | 1970-12-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS4713253A JPS4713253A (Direct) | 1972-07-06 |
| JPS553880B1 true JPS553880B1 (Direct) | 1980-01-28 |
Family
ID=22278594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10328771A Pending JPS553880B1 (Direct) | 1970-12-21 | 1971-12-21 |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3701854A (Direct) |
| JP (1) | JPS553880B1 (Direct) |
| BE (1) | BE776862A (Direct) |
| CA (1) | CA935583A (Direct) |
| DE (1) | DE2163440C3 (Direct) |
| FR (1) | FR2119501A5 (Direct) |
| GB (1) | GB1369460A (Direct) |
| IT (1) | IT943310B (Direct) |
| NL (1) | NL7117196A (Direct) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH580372A5 (de) * | 1973-08-29 | 1976-09-30 | Telefonbau & Normalzeit Gmbh | Fernsprechvermittlungsanlage |
| JPS566662B2 (Direct) * | 1973-11-27 | 1981-02-13 | ||
| US3941944A (en) * | 1974-03-04 | 1976-03-02 | Mcintosh Alexander C | Signalling device for key telephone systems |
| DE2422806C3 (de) * | 1974-05-10 | 1985-08-29 | Neumann Elektronik GmbH, 4330 Mülheim | Einrichtung zur Konzentration der Linienwahlmittel in einer tastengesteuerten Sprechanlage |
| JPS5140011A (en) * | 1974-10-01 | 1976-04-03 | Oki Electric Ind Co Ltd | Pb sendahoshiki |
| US3971899A (en) * | 1975-04-18 | 1976-07-27 | Mcintosh Alexander C | Signalling device for key telephone systems |
| SE7609646L (sv) * | 1976-09-01 | 1978-03-02 | Ellemtel Utvecklings Ab | Flerapparatsystem |
| GB1595301A (en) * | 1976-12-10 | 1981-08-12 | Plessey Canada | Electronic telephone system |
| US4088844A (en) * | 1976-12-21 | 1978-05-09 | Bell Telephone Laboratories, Incorporated | Telephone station set interface circuit |
| JPS53100702A (en) * | 1977-02-15 | 1978-09-02 | Nippon Telegr & Teleph Corp <Ntt> | Key telephone equipment |
| US4112261A (en) * | 1977-05-16 | 1978-09-05 | The Anaconda Company | Key telephone system and method |
| US4173714A (en) * | 1977-06-03 | 1979-11-06 | Tie/Communications, Inc. | Communication circuit with combined power feed and data transmission over a phantom channel |
| US4188511A (en) | 1978-01-27 | 1980-02-12 | Tone Commander Systems, Inc. | Multi-link telephone intercom system |
| US4178480A (en) * | 1978-07-20 | 1979-12-11 | Bell Telephone Laboratories, Incorporated | Signal multiplexing circuit |
| USRE31510E (en) | 1978-07-20 | 1984-01-24 | Bell Telephone Laboratories, Incorporated | Signal multiplexing circuit |
| US4171467A (en) * | 1978-07-20 | 1979-10-16 | Bell Telephone Laboratories, Incorporated | Signal multiplexing circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1596576A (Direct) * | 1968-09-13 | 1970-07-31 | ||
| US3604857A (en) * | 1969-07-25 | 1971-09-14 | Bell Telephone Labor Inc | Line-oriented key telephone system |
-
1970
- 1970-12-21 US US100202A patent/US3701854A/en not_active Expired - Lifetime
-
1971
- 1971-08-25 CA CA121322A patent/CA935583A/en not_active Expired
- 1971-12-15 NL NL7117196A patent/NL7117196A/xx not_active Application Discontinuation
- 1971-12-17 GB GB5860171A patent/GB1369460A/en not_active Expired
- 1971-12-17 BE BE776862A patent/BE776862A/xx unknown
- 1971-12-20 FR FR7145793A patent/FR2119501A5/fr not_active Expired
- 1971-12-20 IT IT71164/71A patent/IT943310B/it active
- 1971-12-21 DE DE2163440A patent/DE2163440C3/de not_active Expired
- 1971-12-21 JP JP10328771A patent/JPS553880B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| NL7117196A (Direct) | 1972-06-23 |
| BE776862A (fr) | 1972-04-17 |
| DE2163440C3 (de) | 1980-09-04 |
| FR2119501A5 (Direct) | 1972-08-04 |
| CA935583A (en) | 1973-10-16 |
| US3701854A (en) | 1972-10-31 |
| JPS4713253A (Direct) | 1972-07-06 |
| DE2163440B2 (de) | 1980-01-03 |
| GB1369460A (en) | 1974-10-09 |
| DE2163440A1 (de) | 1972-07-20 |
| IT943310B (it) | 1973-04-02 |