Awarding of airworthiness certificate to the Kolibrie helicopter. PH-ACA is on the right. Also seen are PH-ACB (c/n 3005), PH-NHI (3001) on the far left and PH-NGV (3007) in the air. There's also a biplane in the air. Photo by: Wim van Rossem / Nationaal Archief (Netherlands)
This photo was added on 2 May 2019, and has since been viewed 375 times.