 Name Withheld, son of Johannes Leonardus "Jan" Dijkgraaf and Maria Margaretha "Mies" van der Putten. PRIVACY FILTERMarried to:  Petronella Alijda Maria "Elly" Visser, age by marriage 26 years, daughter of Johannes Gerardus Maria Visser and Theodora "Thea" van Eijndthoven.Born 29 Aug 1939 Amersfoort, died 12 Jul 2021 Delft, age 81 years Children: | |||