Helicopter Aircraft Bruno Nagler Original Patent Lithograph 1932
On this original linen-backed lithograph from 1932 (includes original specification sheet), Bruno Nagler patented improvements in or relating to helicopter aircraft. Bruno Nagler, whose earliest rotary wing experiments go back to 1929, emigrated to the United States in 1952.
There he has built various prototypes, all single-seat, like his former designs, but with a totally different concept of an anti-torque rotor in the extension of the main rotor.
All patent lithographs sold by Maymont Group are 100% ORIGINAL.
These documents are NOT reproductions or posters (patent art).
These are the original lithographs found in books obtained from the Patent and Trademark Office directly.
In the 1800's and early 1900's, inventors would submit a detailed drawing of the invention and/or improvements to the patent and trademark office. Once received and if approved, the Patent office would then send a letter of confirmation to the inventor and begin to take that drawing and etch it into stone in order to create and print this linen-backed lithograph. These documents are the original hard copies that were created by the patent office's artists, and act as patent examiner reference material. With that being said, these are 100% original and are the only physical copies in existence.
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