Aeroplane Wings Leon Stein Original Patent Lithograph 1932
On this original linen-backed lithograph from 1932 (includes original specification sheet),
Leon Stein, a U.S. citizen, patented improvements in aeroplane wings. The present improvements relate to the construction of the aeroplane wing in which the wing surface of the aeroplane is adjustable as to area to provide greater or lesser lifting power to suit varying flying conditions by means of end portions which can be extended and retracted.
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