an Entity references as follows:
Friedrich Wilhelm Sander (25 August 1885 in Glatz (Kłodzko) – 15 September 1938) was a German pyrotechnics and rocket technology engineer as well as manufacturer remembered for his contributions to rocket-powered flight as key protagonist of the Opel-RAK program. He was married to Cäcilie Sander and had three boys: Hans HW (1918-1998), Bruno (1918-1983) and Herbert (1920-?).