US Patent No. 616,466, granted December 27, 1898 to Thomas F. Hutchinson of Chicago, assignor to the American Cotton Company, for a multiple cotton gin. The machine uses several gangs of saws in one horizontal plane, with grooved rollers between them, spiked feed-rollers beneath each gang, and perforated aprons that let seed and trash fall out. The document has four sheets of drawings (Figs. 1-4) followed by the specification and eight claims. It covers the construction and operation of the gin, including the brushes and lint-flues that remove cotton from the saws.