. "Appendix B: The Leading Edge in Aerospace Propulsion." Materials Needs and Research and Development Strategy for Future Military Aerospace Propulsion Systems. Washington, DC: The National Academies Press, 2011.
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Materials Needs and R&D Strategy for Future Military Aerospace Propulsion Systems
FIGURE B.28 Number of patents related to the keyword “Supersonic” filed at five patent offices, for the years 1961-2009, according to data from the Scopus database. The search is refined by the word “Aerospace.”