 Hubertus Hermanus "Bertus" Dijkgraaf, son of Pieter "Piet" Dijkgraaf and Jannigje Plonia "Jans" van Loon.Born 11 Nov 1936 Rotterdam, died 21 Jan 1990 Culemborg, 53 years Married to:  Name Withheld, daughter of Bastiaan Cornelis "Bas" Schilperoordt and Dirkje "Dit" Assenberg. PRIVACY FILTERChild: | |||