Low air resistance in a vacuum
Moving thin aluminum leafs in atmospheric pressure and in a vacuum.
Bewegte dünne Aluminium-Blätter in Atmosphärendruck und in einem Vakuum.
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![Damaged Japanese Aircraft on Clark Field, Manila 1945 [ WWII DOCUMENTARY ]](https://sun9-79.userapi.com/4lwkxbsr5saChenzKl-yMoVfLTb28pdEvqD2iA/oZ9yYx7UBi4.jpg)
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