<a href="https://en.wikipedia.org/wiki/en:Bell_207" class="extiw" title="w:en:Bell 207">Bell Model 207 Sioux Scout</a> only prototype (N73927) flight tested in 1963-1964.
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US Army <a rel="nofollow" class="external autonumber" href="http://www.helis.com/timeline/bell2.php">[1]</a></div>
1963-1964
<a rel="nofollow" class="external autonumber" href="http://stingraysrotorforum.activeboard.com/t36235202/bell-model-209-ah-1-hueycobra/?page=1&amp;sort=newestFirst">[2]</a>