Kampuchea 1987 Experimental Aircraft Design 7 value set featuring Leonardo da Vinci's "
Ornithopter" 1490; Horatio Phillip's "
multiplane" model 1893; John Stringfellow's steam-powered model 1848; Thomas Moy's "
Aerial Steamer" 1875; Sir George Caley's "
convertiplane" 1843; Sir Hiram Maxim's "
Flying Test Rig" 1894; William Henson's "
Aerial Steam Carriage" 1842 - in superb u/m (mnh) condition - excellent country, aircraft, aviation, people, engineering thematics
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