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| 1925 |
| | The German navy adapts a civilian encryption machine, Enigma, for military purposes | |
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| 1926 |
| | John Logie Baird gives the world's first demonstration of television to a group assembled in his attic rooms in London | |
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| 1926 |
| | Russian World War I pilot Sergey Ilyushin begins a distinguished career as an aircraft designer | |
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| 1927 |
| | US aviator Charles Lindbergh, in his single-engine plane Spirit of St Louis, flies solo across the Atlantic from New York to Paris | |
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| 1928 |
| | British inventor John Logie Baird secures a patent for fibreoptic imaging | |
| | Fibre optic gastroscopy, 1998 Wellcome Library, London
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| 1929 |
| | The British Broadcasting Corporation uses Logie Baird's system for its first trial TV broadcasts | |
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| 1929 |
| | US explorer Richard E. Byrd and two companions make the first flight over the South Pole, in a Ford Tri-Motor | |
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| 1930 |
| | British inventor Frank Whittle takes out a patent for a jet engine | |
| | Sketches towards the design of Whittle's jet engine National Archives, Kew
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| 1930 |
| | English pioneer aviator Amy Johnson makes a 19-day solo flight in a Gipsy Moth from Croydon (part of London) to Darwin, Australia | |
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| 1930 |
| | The airship R101, designed by a UK Air Ministry team, explodes on its maiden vogage, killing all but four of those on board | |
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