LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY
Berliner helicopter. This helicopter was invented by the German Emile Berliner (1851-1929), possibly as early as 1909. By 1922, he and his son Henry Berliner (1895-1970, born in the USA), demonstrated a working helicopter for the US Army. Photograph from the Bain News Service.
Model release not required. Property release not required.