GB717740A - Improvements in or relating to telephone or like systems - Google Patents
Improvements in or relating to telephone or like systemsInfo
- Publication number
- GB717740A GB717740A GB562654A GB562654A GB717740A GB 717740 A GB717740 A GB 717740A GB 562654 A GB562654 A GB 562654A GB 562654 A GB562654 A GB 562654A GB 717740 A GB717740 A GB 717740A
- Authority
- GB
- United Kingdom
- Prior art keywords
- july
- response
- description
- systems
- telephone
- 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
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
717,740. Automatic exchange systems. BRITISH TELECOMMUNICATIONS RESEARCH, Ltd. July 10, 1952 [July 25, 1951], No. 5636/54. Divided out of 717,687. Drawings to Specification. Class 40 (4) Wanted subscribers' numbers are recorded on a magnetic drum in response to the operation of a keyset, the recording being effected, in code in response to the selective connection of potential over the contacts of the keys to a group of leads extending to the control equipment for the drum.. The description is included in the description of Specification 717,687 but the claims differ. Specifications 681,360 and 717,688 also are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB562654A GB717740A (en) | 1951-07-25 | 1951-07-25 | Improvements in or relating to telephone or like systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB562654A GB717740A (en) | 1951-07-25 | 1951-07-25 | Improvements in or relating to telephone or like systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB717740A true GB717740A (en) | 1954-11-03 |
Family
ID=9799621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB562654A Expired GB717740A (en) | 1951-07-25 | 1951-07-25 | Improvements in or relating to telephone or like systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB717740A (en) |
-
1951
- 1951-07-25 GB GB562654A patent/GB717740A/en not_active Expired
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