Des Moines Register: Deere & Co. is trying to block two Iowa manufacturers from selling competing products that allow farmers to sow their fields faster. The Quad Cities-based agricultural giant filed patent infringement lawsuits against Williamsburg-based Kinze Manufacturing and Ames-based Ag Leader in U.S. District Court on Dec. 4, alleging that the competitors' new devices are too similar to a product Deere debuted seven years ago.