Born ‎28-2-1912 The Hague, Netherland, died ‎4- May 1989 Heerenveen, Netherland‎, 76 or 77 years. Son of Leo Maurits Gerard Kooperberg - Warendorf and Estella Beerenborg - Blauw‏

Born ‎14-9-1912 Oostzaan, Belgium, died ‎12-3-1999 Wolvega, Netherland‎, 86 or 87 years