GB522094A - Improvements in or relating to automatic or semi-automatic telephone systems - Google Patents

Improvements in or relating to automatic or semi-automatic telephone systems

Info

Publication number
GB522094A
GB522094A GB2828239A GB2828239A GB522094A GB 522094 A GB522094 A GB 522094A GB 2828239 A GB2828239 A GB 2828239A GB 2828239 A GB2828239 A GB 2828239A GB 522094 A GB522094 A GB 522094A
Authority
GB
United Kingdom
Prior art keywords
automatic
translator
grounding
digit
relay
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
Application number
GB2828239A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Priority to GB2828239A priority Critical patent/GB522094A/en
Priority to GB277739A priority patent/GB523443A/en
Publication of GB522094A publication Critical patent/GB522094A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Meter Arrangements (AREA)

Abstract

522,094. Automatic exchange system. POLLAK, J. E. (Associated Telephone & Telegraph Co.). Nov. 30, 1938, No. 28282/39. Divided out of 516,348 and 516,408. Drawings to Specification. [Class 40 (iv)] The system described in Specification 516,348 is provided with arrangements for restricting the service from certain substations. The restriction may be effected by grounding the mid-point of the ringer windings and in the case of an hotel, for example the grounding is controlled by the proprietor. The ground prevents the operation of one of the loop feed-relays at the register-translator and this in conjunction with the operation of a relay when a first digit " O " is dialled brings about the release of the registertranslator. Some calls having a first digit " O " may however be permitted by arranging that the relay which is operated to bring about the release of the register-translator is subsequently shunted down by a circuit over the charge assessing switch (TD3). set in accordance with the setting of two bi-directional switches (TD1, TD2) which respond to the zone and exchange digits respectively. These arrangements are described with reference to Figure 27 (not shown) which does not appear in the abovementioned Specification. Specification 516,409 also is referred to.
GB2828239A 1938-11-30 1938-11-30 Improvements in or relating to automatic or semi-automatic telephone systems Expired GB522094A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2828239A GB522094A (en) 1938-11-30 1938-11-30 Improvements in or relating to automatic or semi-automatic telephone systems
GB277739A GB523443A (en) 1938-11-30 1939-01-04 Improvements in or relating to automatic or semi-automatic telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2828239A GB522094A (en) 1938-11-30 1938-11-30 Improvements in or relating to automatic or semi-automatic telephone systems

Publications (1)

Publication Number Publication Date
GB522094A true GB522094A (en) 1940-06-07

Family

ID=10273179

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2828239A Expired GB522094A (en) 1938-11-30 1938-11-30 Improvements in or relating to automatic or semi-automatic telephone systems
GB277739A Expired GB523443A (en) 1938-11-30 1939-01-04 Improvements in or relating to automatic or semi-automatic telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB277739A Expired GB523443A (en) 1938-11-30 1939-01-04 Improvements in or relating to automatic or semi-automatic telephone systems

Country Status (1)

Country Link
GB (2) GB522094A (en)

Also Published As

Publication number Publication date
GB523443A (en) 1940-07-15

Similar Documents

Publication Publication Date Title
GB516415A (en) Improvements in or relating to automatic or semi-automatic telephone systems
US2523914A (en) Radiotelephone system
US3335226A (en) Combined telephone and data switching system
US2975237A (en) Telephone conference circuit
GB522094A (en) Improvements in or relating to automatic or semi-automatic telephone systems
US2416131A (en) Automatic telephone system
US2431850A (en) Relay automatic telephone system
US2375678A (en) Telephone system
US2955161A (en) Tone detector for coin control
US2519867A (en) Restricted service telephone system
US3347989A (en) Stock quotation switching system utilizing switching means for alternating the connection of a register and its associated trunk
US2298489A (en) Group-call telephone system
US2337365A (en) Telephone system
US2541624A (en) Automatic telephone system-trunk selection
US3143601A (en) Automatic number intercept identification system
US2906998A (en) Signaling system
US2065894A (en) Telephone system
US3218392A (en) Signalling system for use with toll ticketing equipment
US2691069A (en) Telephone intercept circuit
US2883462A (en) Party line paystation
US2142658A (en) Telephone system
US1501235A (en) Telephone trunk circuits
US2333489A (en) Telephone system
US1717893A (en) Telephone system
US2290986A (en) Key-set circuit