 Derk Jan "Dirk" Dijkgraaf, son of Cornelis "Coen" Dijkgraaf and Derkje van Assen.Born 07 Oct 1920 Heerde, died 06 Aug 2005 Sliedrecht, 84 years, buried 11 Aug 2005 Sliedrecht, Algemene Begraafplaats. Occupation: chef werkplaats Married 21 Jan 1953 Rotterdam (45 years married) to:  Theodora "Dora" Sonneveld, daughter of Cornelis Sonneveld and Geertruida Johanna Cornelia "Truida" Lancee.Born 22 May 1920 Rotterdam, died 08 Dec 1998 Sliedrecht, 78 years, buried Sliedrecht, Algemene Begraafplaats | |||