Sommer, Helmut 1922-2011 creator mixed material monographic eng ger 50 1 1 0.2 Correspondence, writings, reports, articles, abstracts, notes, biographical material, charts, graphs, photographs, and other papers relating chiefly to Sommer's work as an electrical engineer in the development of radar and fuze technology while working for the U.S. National Bureau of Standards and the Diamond Ordnance Fuze Laboratories. Open to research. Classified, in part. Electrical engineer. Collection material in English and German. United States. National Bureau of Standards. Diamond Ordnance Fuze Laboratories (U.S.) Electrical engineering Fuzes (Ordnance) Radar Electrical engineers mm2012085751 Open to research. Classified, in part. DLC 120703 20260227111733.0 mm2012085751 eng