21![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 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](https://www.pdfsearch.io/img/a9613897211e0293ca459b1e22d0c531.jpg) | Add to Reading ListSource URL: roadrunnersinternationale.comLanguage: English - Date: 2010-07-27 17:50:10
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22![](/pdf-icon.png) | Add to Reading ListSource URL: events.oasis-open.org- Date: 2009-10-06 12:40:08
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