Original linen-backed patent lithographs for the DeHavilland Aircraft Company's improvements relating to aeroplane wings, two pages, 12.5 x 10.25, April 29, 1932. The diagrams feature large and impressive views of the wing design and its location on the airplane body. The top borders read: "372,344 Complete Specification." The lower borders feature the printed text: "Charles & Read Ltd. Photo Litho." The left borders read: "This Drawing is a reproduction of the Original on a reduced scale." Includes the printed British "Patent Specification" document, three pages on two sheets, which describes the invention as a "novel construction of folding wings." The specification sheet bears a "U.S. Patent Office Library" ink stamp on the first page. In fine condition.
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