• 7260 - Viester - April 1960 (est)
  • 7261 - van Zelst - April 1960 (est)
  • 7262 - Kiestra - April 1960 (est)
  • 7263 - Lande - April 1960 (est)
  • 7264 - Beukes - April 1960 (est)
  • 7265 - Kleeven - April 1960 (est)