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Siemetzki ASRO 4
Siemetzki ASRO 4 (c/n 1, no registration) experimental rotorcraft, exhibited at Hubschraubermuseum Bückeburg (Bückeburg Helicopter Museum), June 2023. The story of amateur-built ASRO rotorcraft begins on 4th September 1930. On that day, Alfons Siemetzki was […]