US Patent Number
A power tillage device is provided having a passive rolling coulter as the prime mover for a power tillage blade which is carried in the lead of the coulter on a transfer case mounted as a radius arm on the counter shaft. The tillage blade rotates in the opposite direction from the coulter and is designed for optimum efficiency for shearing and lifting soil from a furrow.
University of Kentucky Research Foundation, Lexington, Ky.
Hammett, Daniel E. and Smith, Edward M., "Ground Driven Power Tillage Device" (1979). Biosystems and Agricultural Engineering Faculty Patents. Paper 12.