1![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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2![](/pdf-icon.png) | Add to Reading ListSource URL: library.pratt.edu- Date: 2014-04-01 13:07:06
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3![](/pdf-icon.png) | Add to Reading ListSource URL: jared.pratt-family.org- Date: 2009-08-16 14:58:36
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4![](/pdf-icon.png) | Add to Reading ListSource URL: jared.pratt-family.org- Date: 2009-08-16 14:57:19
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5![](/pdf-icon.png) | Add to Reading ListSource URL: jared.pratt-family.org- Date: 2009-08-16 14:58:53
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6![](/pdf-icon.png) | Add to Reading ListSource URL: jared.pratt-family.org- Date: 2009-08-16 14:57:53
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7![](/pdf-icon.png) | Add to Reading ListSource URL: library.pratt.edu- Date: 2014-04-01 13:04:24
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8![](/pdf-icon.png) | Add to Reading ListSource URL: jared.pratt-family.org- Date: 2009-08-22 12:01:33
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9![](/pdf-icon.png) | Add to Reading ListSource URL: library.pratt.edu- Date: 2014-04-01 13:07:03
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10![](/pdf-icon.png) | Add to Reading ListSource URL: jared.pratt-family.org- Date: 2009-08-16 14:59:13
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