Image: A hand-drawn schematic of wool shears, submitted by David Unaipon and dated 3 September 1909. The patent application number is 15,624/09
Sketch of an 'Improved Mechanical Motion Device' (wool shearing handpiece) invented by David Unaipon, 3 September 1909
Courtesy of/Photographer
Department of Patents, Commonwealth of Australia

Image courtesy of the Flinders University Department of Computer Science, Engineering and Mathematics,