ag history By mstrickland 1774 Iron Plow was invented by Jethro Wood https://www.farmanddairy.com/columns/debate-who-really-invented-the-steel-plow/455386.html 1786 Thresher was invented by Andrew Meikle https://www.pinterest.co.uk/pin/465067098990427990/ 1794 Thomas Jefferson invented the Iron Plow and he was on the two dollar bill. https://www.farmanddairy.com/columns/debate-who-really-invented-the-steel-plow/455386.html 1794 Cotton Gin was invented by Eli Whitney https://mtviewmirror.com/eli-whitney-inventor-of-the-cotton-gin/ 1794 Eli Whitney invented the Cotton Gin in 1794. https://mtviewmirror.com/eli-whitney-inventor-of-the-cotton-gin/ 1831 Cyrus McCormick invented the Mechanical Reaper http://www.tractorfriends.org/miscellany/haroldsreaper/reaper.html 1834 Reaper was invented by Cyrus McCormick https://www.pinterest.co.uk/pin/306526318360696230/ 1834 Combine Harvester was invented by Hiram Moore in 1834. https://en.wikipedia.org/wiki/Combine_harvester 1834 Planter/Seeder was invented by Henry Blare in 1834. http://www.suttonag.com/clean_seeder_tp1.html 1837 Steel Plow was invented by John Deere https://agriculturalrev.weebly.com/steel-plow.html 1837 John Deere invented the Steel Plow https://agriculturalrev.weebly.com/steel-plow.html 1850 Corn Picker was invented by Edmund Quincy in 1850 http://www.knuckleheadquarters.net/cornpicker.html 1874 Barbed wire was invented by Joseph Glidden in 1874. http://bantjes.com/barbed-wire/ 1879 Anna Baldwin invented and patented the milking machine in 1879 https://edu.glogster.com/glog/brooke/1cuvu19c2qm 1879 Milking Machine was invented by Anna Baldwin in 1879 https://edu.glogster.com/glog/brooke/1cuvu19c2qm 1892 Tractor was invented by Benjamin Holt http://www.wikiwand.com/en/Benjamin_Holt 1896 George Washington Carver was the inventor of peanut butter https://www.thinglink.com/scene/645309589830500352 1906 Benjamin Holt invented the Tractor in about 1906 https://www.pinterest.com/pin/157485318198551662/