Georgetown Herald (Georgetown, ON), 17 Oct 1963, p. 1 Harold Koehler, test pilot for the Avian 2-180 Gyroplane receives compliments from U.S. Army Major John Campbell after a flight demonstration at Downsview Air Force Base by Avian Aircraft Ltd.
Georgetown Herald (Georgetown, ON), 17 Oct 1963, p. 1 Harold Koehler, test pilot for the Avian 2-180 Gyroplane receives compliments from …