First flight of the Asboth AH4
Wednesday, September 17, 1930
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Description
Flown by Liptrot, it was the last of four helicopters built by Oscar de Asboth between 1928 and 1930. Source: “A History of British Rotorcraft 1866-1965”, Compiled by R.A.C. Brie, August 1968, Westland Helicopters Limited, Page 27
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