3-view drawing of the French 1940s experimental aircraft <a href="https://en.wikipedia.org/wiki/en:Makhonine_Mak-123" class="extiw" title="w:en:Makhonine Mak-123">w:en:Makhonine Mak-123</a>, designed by Ivan Ivanovič Mahonin. It featured "telescopic" extensible wings.
<a href="//commons.wikimedia.org/wiki/User:MLWatts" title="User:MLWatts">MLWatts</a>
<span class="int-own-work" lang="en">Own work</span>