GB542827A - Improvements in or relating to telephone exchange systems - Google Patents
Improvements in or relating to telephone exchange systemsInfo
- Publication number
- GB542827A GB542827A GB764/41A GB76441A GB542827A GB 542827 A GB542827 A GB 542827A GB 764/41 A GB764/41 A GB 764/41A GB 76441 A GB76441 A GB 76441A GB 542827 A GB542827 A GB 542827A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- tubes
- lamps
- tube
- group
- 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
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US542827XA | 1930-01-23 | 1930-01-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB542827A true GB542827A (en) | 1942-01-28 |
Family
ID=21989978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB764/41A Expired GB542827A (en) | 1930-01-23 | 1941-01-20 | Improvements in or relating to telephone exchange systems |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB542827A (xx) |
NL (1) | NL61603C (xx) |
-
0
- NL NL61603D patent/NL61603C/xx active
-
1941
- 1941-01-20 GB GB764/41A patent/GB542827A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL61603C (xx) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB547553A (en) | Improvements in telecommunication exchange systems | |
US2458030A (en) | Selective signaling apparatus and system | |
US2379715A (en) | Communication system | |
US2638505A (en) | Pulse electronic switching system | |
US2291481A (en) | Telephone system | |
GB683794A (en) | Telephone station identifier circuit | |
GB471193A (en) | Improvements in electric signalling systems | |
GB542827A (en) | Improvements in or relating to telephone exchange systems | |
GB1032247A (en) | Improvements in information display systems | |
GB675088A (en) | Improvements in or relating to automatic telephone systems | |
US2241031A (en) | Telephone system | |
US1663747A (en) | Telephone-exchange system | |
US2885482A (en) | Automatic telephone systems | |
US2299212A (en) | Telephone system | |
US2242285A (en) | Telephone system | |
US2287881A (en) | Telephone system | |
US2699467A (en) | Telephone system and a relayless line circuit and circuits in cooperation therewith for extending a call | |
US2289503A (en) | Telephone system | |
US1855724A (en) | Multioffice telephone system | |
GB654311A (en) | Improvements in automatic telephone switching systems | |
US2341919A (en) | Telephone system | |
US2356519A (en) | Communication system | |
US2566010A (en) | Telephone system | |
US2310634A (en) | Communication system | |
US2523365A (en) | Testing system for cathode-ray telephone switching apparatus |