path: root/televäxel.wiki

https://www.youtube.com/watch?v=_s7DWF1p8FU
https://www.google.se/search?q=telephone+exchange+system+diy&oq=telephone+exchange+system+diy&aqs=chrome..69i57.23711j0j7&sourceid=chrome&ie=UTF-8
https://sv.wikipedia.org/wiki/Televerket