• 6988 - Riksma - June 1956 (est)
  • 6989 - van Vek ? - June 1956 (est)
  • 6990 - Hartog - June 1956 (est)
  • 6991 - Hendriks - June 1956 (est)
  • 6992 - Vulpen? - June 1956 (est)
  • 6993 - de Groot - June 1956 (est)
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