Lewitsky - Improved Flying Machine, British Patent 3305 of 1910
A British patent specification, No. 3305 of 1910, filed by Wasily Lewitsky and Paul Lyssow and printed in 1911 for the Patent Office and engineers reading claims for an improved flying machine. The plates are line drawings in ink on tinted stock: numbered figures of a wing in side elevation, a mast and wheeled undercarriage, and fan-shaped rotor segments, with handwritten annotations, reference numerals, and stamped archive marks.
