Ellehammer Disc-Rotor Helicopter model of 1935.
<p>Unknown<br></p>
Uploaded by <a href="https://en.wikipedia.org/wiki/User:Vertiflite" class="extiw" title="en:User:Vertiflite">Vertiflite</a> at en.wikipedia
1935
<p>Photo from the French Musée de l'Air et de l'Espace.
</p>
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