Adams & Chittenden Image Index
1929. Vacuum Pumps. Cecil R Burch produces a gas diffusion pump employing low vapour pressure oils. 1929. Radio. Complete amateur radio station with one valve transmitter and one valve receiver. 1929. Television. On 20th August the first experimental 30 line television pictures from Baird's studio were broadcast.
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r-type's website is r-type.org