 David Dijkgraaf, son of Maarten Dijkgraaf and Cornelia Potters.Born 07 Feb 1902 Rotterdam, died 17 Mar 1969 Rotterdam, age 67 years. Occupation: kapitein/eigenaar van de sleepboot "Quarto"/kantoorbediende bij P. Smit Married 05 Aug 1925 Rotterdam, age 23 years (married 40 years) to:  Wilhelmina "Mien" van Zonneveld, age by marriage 27 years, daughter of Bastiaan Bernardus Frederik van Zonneveld and Aletta Johanna Lupke.Born 26 Jan 1898 Rotterdam, died 17 Oct 1965 Rotterdam, age 67 years Children: | |||