 Date: 2010-07-27 17:50:10Aircraft Aviation Signals intelligence Black projects Lockheed SR-71 Blackbird Lockheed A-12 Lockheed YF-12 Kelly Johnson Lockheed U-2 Area 51 Edwards Air Force Base Skunk Works | |  A-12, YF-12A, & SR-71 Timeline of Events JuneMay 1956 Pratt & Whitney contract to develop engine(JT9) for CL-400; J-58 (JT 11D-20) is 80% size of JT9 (SME)1 May 1956 Pratt & Whitney contract to develop engine(JT9
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