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Group switching centres formed a component of the trunk mechanisation hierarchy that was commenced in 1939. The concept of group switching centres became important with the introduction of subscriber trunk dialling (STD) in 1958, initially from Bristol central telephone exchange. They were typically located towards the centre of their corresponding group area, usually in a large town or city, and serviced a group of local and dependent telephone exchanges within their home and adjacent group areas. From 1 January 1958, the British network was divided into 639 charging groups. These areas provided the basis for tariff calculations for telephone calls.

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Comment by Michael Grove on June 27, 2022 at 10:01

 My soul-mate Linnie’s father Ronald Arthur Yardley, who built his
 own Colour Television Receiver • in a kitchen cupboard under the  
 stairs of their semi-detached house in Borehamwood • well in advance  
 of the first TEST COLOUR TRANSMISSIONS from the BBC • had himself
 been offered a job at Goonhilly Down, by GPO Telecommunications,
 well before researchers started to investigate packet switching • a
 technology that sends a message in portions to its destination
 asynchronously without passing it through a centralised mainframe •
 but having travelled there by train from where the family were living in
 Kentish Town, North London, he was unable to find somewhere for the
 family to live locally, and so could not take up the position that he had
 been offered. Thankfully not long after, the doctor who was attending  
 Linnie’s brother Terry, who suffered terribly during the days of the
 smog in London, arranged for the family to move to their new home in
 Borehamwood. When I started training as an Air Traffic Controller,
 cutting my teeth so to speak, on the study of IBM 64K core-store
 mainframe systems analysis, as well as all things technologically
 related to primary and secondary radar systems, you can just imagine
 the conversations that I had with Ron, and not long after I had asked
 him for his daughter’s hand in marriage, that a telecommunications
 network protocol emerged which constituted the beginnings of the
 ARPANET, which by 1981 had grown to 213 nodes. ARPANET
 eventually merged with other networks to form the INTERNET
 and while Internet development was a focus of the Internet Engineering
 Task Force (IETF) who published a series of Request for Comment
 documents, other networking advancement occurred in industrial
 laboratories, such as the local area network (LAN) developments of

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