GB283971A - Improvements in electric circuits for central telephone offices - Google Patents
Improvements in electric circuits for central telephone officesInfo
- Publication number
- GB283971A GB283971A GB1959/28A GB195928A GB283971A GB 283971 A GB283971 A GB 283971A GB 1959/28 A GB1959/28 A GB 1959/28A GB 195928 A GB195928 A GB 195928A GB 283971 A GB283971 A GB 283971A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- over
- finders
- jan
- electric circuits
- 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
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
283,971. Ericsson-Fatme, and Rosa, A. Jan. 20, 1928. [A Specification was laid open to inspection under Sect. 91 of the Acts, Jan. 22, 1928]. Automatic and semi-automatic exchange systems.-A group of finders is controlled by a common relay E connected to the lines A through high and low resistances D, C. On a call occurring, the relay E is energized over B, A, C, D, E and starts the finders. When a finder W meets the calling line, relay G is energized over B, A, C, F. G, locks itself over the b bank and the calling line, and energizes a slow-release relay H to short-circuit the relay E. Relay G may serve as an impulse relay. The Specification as open to inspection under Sect. 91 (3) (a) comprises also means for directly short-circuiting relay E over a contact of relay G. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1723524X | 1927-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB283971A true GB283971A (en) | 1929-07-22 |
Family
ID=11434533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1959/28A Expired GB283971A (en) | 1927-01-31 | 1928-01-20 | Improvements in electric circuits for central telephone offices |
Country Status (3)
Country | Link |
---|---|
US (1) | US1723524A (en) |
GB (1) | GB283971A (en) |
NL (1) | NL30173C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE893518C (en) * | 1949-01-17 | 1953-10-15 | Philips Nv | Circuit arrangement for a telecommunications system |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL63840C (en) * | 1945-09-03 | |||
NL141296B (en) * | 1948-07-02 | Thomson Houston Comp Francaise | DOPPLER RADAR SYSTEM. | |
US3156779A (en) * | 1960-11-25 | 1964-11-10 | Automatic Elect Lab | Line finding arrangement |
-
0
- NL NL30173D patent/NL30173C/xx active
-
1928
- 1928-01-20 GB GB1959/28A patent/GB283971A/en not_active Expired
- 1928-01-30 US US250586A patent/US1723524A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE893518C (en) * | 1949-01-17 | 1953-10-15 | Philips Nv | Circuit arrangement for a telecommunications system |
Also Published As
Publication number | Publication date |
---|---|
NL30173C (en) | |
US1723524A (en) | 1929-08-06 |
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