Televerket Swedish governmental agency manufactured its own design (the Gotthilf Betulander design from 1919, inspired by the Western Electric system), and used...
21 KB (2,972 words) - 10:25, 21 February 2024
exchanges based solely on relay switching techniques designed by Gotthilf Ansgarius Betulander. The first public relay based telephone exchange in the UK was...
49 KB (6,428 words) - 04:36, 27 June 2024