History | Page 169

5. Freeman, Gordon Dr., personal letter to author dated 3/7/02 6. United States Patent, Patent Number 3,949,178, April 6, 1976, granted to Sten Hellstroem and Rolf Bertil Goeran Joenson, assigned to Telefonaktiebolaget L M Ericsson 7. Bundersarkiv, Postfach 450569, 12175 Berlin, file on Dr. W. 0. Schumann, courtesy of Mark D. Kneipp. 8. Foreign Scientists Case Files, 1945-58 "Winfreid Otto Schumann", Location Box 151,631/26/01/07, The National Archives, 8601 Adelphi Rd., College Park, Maryland 20740, Courtesy of Mark Kneipp 9. British Intelligence Objectives Sub-Committee Final Report