 Name Withheld, son of Johannes Leonardus "Jan" Dijkgraaf and Maria Margaretha "Mies" van der Putten. PRIVACY FILTERMarried to:  Petronella Alijda Maria "Elly" Visser, daughter of Johannes Gerardus Maria Visser and Theodora "Thea" van Eijndthoven.Born 29 Aug 1939 Amersfoort, died 12 Jul 2021 Delft, 81 years Children: | |||