While in the 1860s, mechanical reducing units had been produced; from these arrived the modern equipment which includes mechanical mowers and balers. In 1872, a reaper that utilised a knotter gadget to bundle and bind hay was invented by Charles Withington; this was commercialized in 1874 by Cyrus McCormick. http://lanedozjv.actoblog.com/15269311/5-simple-techniques-for-welger-sm450-parts-catalog