As wheat farming expanded, the demand for mills and farm equipment grew. The first large foundry was established in Chortitza in 1860 and other firms followed. By 1911 the eight largest Mennonite-owned factories produced 6% of the total Russian output (over 3 million rubles), shipped machinery to all parts of the empire and employed 1744 workers. The annual output of "Lepp and Wallman" of Schönwiese was 50,000 mowers, 3000 threshing machines, thousands of gangplows in addition to other farm equipment. Flour and feed mills were originally wind-powered, a skill transplanted from Prussia. These were eventually replaced with motor- and steam-driven mills. Milling and its supporting industries grew to dominate the industrial economy of the colonies and nearby communities.