GB556929A - Improvements in or relating to automatic or semi-automatic telephone systems - Google Patents
Improvements in or relating to automatic or semi-automatic telephone systemsInfo
- Publication number
- GB556929A GB556929A GB1487143A GB1487143A GB556929A GB 556929 A GB556929 A GB 556929A GB 1487143 A GB1487143 A GB 1487143A GB 1487143 A GB1487143 A GB 1487143A GB 556929 A GB556929 A GB 556929A
- Authority
- GB
- United Kingdom
- Prior art keywords
- automatic
- relating
- semi
- telephone systems
- impulses
- 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
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H67/00—Electrically-operated selector switches
- H01H67/02—Multi-position wiper switches
- H01H67/04—Multi-position wiper switches having wipers movable only in one direction for purpose of selection
- H01H67/12—Linear-motion switches
Landscapes
- Interface Circuits In Exchanges (AREA)
- Telephonic Communication Services (AREA)
Abstract
556,929. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., and BAKER, G. T. April 20, 1942, No. 14871/43. Divided out of 556,922. Drawings to Specification. [Class 40 (iv)] The description is the same as a part of that in Specification 556,922. The claims relate to the transmission of impulses of alternating current between exchanges, such impulses being short compared with the duration of the initiating impulses and unaffected by such duration. Specifications 545,634, 549,047, 551,187, 556,919, 556,920 and 556,921 also are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1487143A GB556929A (en) | 1942-04-20 | 1942-04-20 | Improvements in or relating to automatic or semi-automatic telephone systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1487143A GB556929A (en) | 1942-04-20 | 1942-04-20 | Improvements in or relating to automatic or semi-automatic telephone systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB556929A true GB556929A (en) | 1943-10-27 |
Family
ID=10048981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1487143A Expired GB556929A (en) | 1942-04-20 | 1942-04-20 | Improvements in or relating to automatic or semi-automatic telephone systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB556929A (en) |
-
1942
- 1942-04-20 GB GB1487143A patent/GB556929A/en not_active Expired
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