A identical slicer to the one shown in our video appears in Thornton's Apple Parers. It appears to be made professionally and is similar in design to a patent granted to Albert J. Rice on January 4, 1881. Rice includes the spirally arranged slicing blades and the curved rotary fingers in his letters patent; however, the drawings illustrate rotary fingers on opposite sides of the center shaft that push two apples into sets of spirally arranged blades positioned 180 degrees to one another as the crank is rotated 360 degrees. Perhaps his model is an earlier version of his invention.
We pared and cored the apple before slicing it.
Rice, A. J.., inventor, Apple-Parer, 1881 Jan. 4. US236178.
Thornton, D. 1997. Apple Parers. Sunnyvale, California: Off Beat Books, p. 173.