Letters Patent – May 19, 1869 – of the United States of America, for an Improvement in Clutch Hook for Slaughtering Purposes, were granted with Samuel Davis and Windsor Leland, of Chicago. Ill. bearing date on the eleventh day of September, 1866 and numbered 57,876. Paid $150 to David L. DeGolyer for rights to use in Reynolds & Comany slaughter house