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Word: c4 (lookup in dictionary) (lookup stats)
Dates: during 1940-1949
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Usage:

Only a few days before the crash of the jet-propelled YB-49, the Civil Aeronautics Administration granted an "Approved Type Certificate" to the Allison model 400-C4 jet engine, first jet engine approved for civilian...

Author: /time Magazine | Title: Science: Over the Desert | 6/14/1948 | See Source »

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