Jhr Mr P.A.van Buttingha Wichers, Notaris te ’s-Gravenhage, Akte van depot ten behoeve van B.V. NERATOOM, 29 April 1980
1.Windmills, 15-07-1975, The Hague 2.Preliminary Calculations of Kite-type Windmills, 30-07-1975
