Military Aircraft HM-1 prototype
<p>Unknown<br></p>
Uploaded by <a href="https://en.wikipedia.org/wiki/User:Bzuk" class="extiw" title="en:User:Bzuk">Bzuk</a> at en.wikipedia
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/sdasmarchives/4590536352/">Source</a>