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man‎Hendricus Petrus "Piet" Dijkgraaf‏‎, son of Leonardus Johannes Dijkgraaf and Anna Maria Elizabeth Arends‏.
Born ‎13 Jan 1892 Delft, died ‎20 Jun 1970 's-Gravenhage‎, 78 years. Occupation: sigarenwinkelier

Married ‎15 Nov 1922 Schiedam (47 years married) to:

womanCornelia Maria de Raaij‏, daughter of Bernardus de Raaij and Catharina Petronella Stroijckens‏.
Born ‎11 Jan 1893 Schiedam, died ‎02 Feb 1970 's-Gravenhage‎, 77 years