 Hendricus Petrus "Piet" Dijkgraaf, son of Leonardus Johannes Dijkgraaf and Anna Maria Elizabeth Arends.Born 13 Jan 1892 Delft, died 20 Jun 1970 's-Gravenhage, age 78 years. Occupation: sigarenwinkelier Married 15 Nov 1922 Schiedam, age 30 years (married 47 years) to:  Cornelia Maria de Raaij, age by marriage 29 years, daughter of Bernardus de Raaij and Catharina Petronella Stroijckens.Born 11 Jan 1893 Schiedam, died 02 Feb 1970 's-Gravenhage, age 77 years | |||