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A wind tunnel which moves air up to a vertical ...
Nano materials describe materials the single units of which ...
Propeller aircraft use one or more propellers (airscrews) ...
Practically all steels,which have been heavily cold ...
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A single-seater helicopter that is made by a 20-year-old ...
A 1.6 ton homemade submarine mostly assembled from metal ...
Invented by Farmer Wu Yulu in a village outside of ...