My grandfather worked with Flowers at the Post Office. They worked on many aspects of digital telecoms for the decades after the war, leading to the world's fir

My grandfather worked with Flowers at the Post Office. They worked on many aspects of digital telecoms for the decades after the war, leading to the world's first digital PCM telephone exchange 'Empress' in London around 1968, and System X nationally in 1980. Around 1986 my high school class did a trip to the town telephone exchange to see the building full of mechanical rotary switch gear that was about to be thrown out, to be replaced by a single 19" rack that contained the digital equivalent. I have copies of some of Grandpa's UK patents including baud rate conversion and other essential components.