Before revision: Klaus, Milestones in the history of agricultural engineering, The world of agricultural engineering 2011 A cast iron plow was first made by Charles Newbold between 17960 and 1796.
After revision: Klaus, Milestones in the history of agricultural engineering, The world of agricultural engineering 2011 A cast iron plow was first made by Charles Newbold between 1790 and 1796.