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 1819: Jethro Wood patented an iron plow with interchangeable parts

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 1819: Jethro Wood patented an iron plow with interchangeable parts

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Jethro Wood developed a three-piece cast-iron plow with interchangeable parts. The moldboard was one piece, the share that cut the furrow was the second, and the third was the landside that guided the plow. This made replacing individual parts cheaper and easier, it also was credited for having good balance and made it easy to create straight lines. This inspired further innovation to the plow.
https://founders.archives.gov/documents/Jefferson/03-10-02-0300

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1834: John Lane began to manufacture plows faced with steel saw blades

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1834: John Lane began to manufacture plows faced with steel saw blades

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Would acquire old steel saw blades from mills, cut them into strips and weld them together so it was soft enough to hammer to the desired shape. The plows had the ability to clear themselves out so prairie soil didn't get stuck to them. Created the first steel plow but never patented his work, or produced them on a large scale.
Source: "John Lane and the First Steel Plow" Lockport Free Press 15 June 1978

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1837: Practical threshing machine patented

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1837: Practical threshing machine patented

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The first threshing machine was known as "Ground Hog". It consisted of a spiked drum which grain, chaff, and straw would come through and would be separated through winnowing.
Source: "Early Thresher History" Farm Power July 1935

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The grain drill in the United States was developed by Samuel and Moses Pennock. It was a wooden roller, that consisted of seven hoes, with a tube that dropped seeds from a hopper into the soil.
Source: "Development of the Grain Drill" by Sam Moore The Farm Collector
https://www.farmcollector.com/equipment/implements/grain-drills-zmlz19marzhur/#:~:text=In%20America%2C%20a%20seven%2Dhoe,that%20led%20to%20the%20hoes.

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Amariah Hills, of Connecticut, receives first US patent for reel type lawn mower, which uses traction as you push it to spin cast iron rollers against the stationary cutting bar.

Source: "Reel Lawn Mower Patent – Today in History: January 28" Connecticut History January 28, 2018

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International Harvester Company (IHC) introduced the first commercial tractor power take off, the model 8-16, to use power from the tractor to power the implement.
Source: "ePTO: The New Generation of PTO. The Big Difference" Viatec September 15, 2019

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IH introduces the Farmall, a tractor that could pull heavy tillage as well as plant and cultivate crops. Before tractors for heavy duty jobs were too heavy for lighter jobs, and lighter tractors didn't have enough power. Having a tractor that could be used for everything kicked off the mechanization of American farms.

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Harry Ferguson found a way to attach an implement to a tractor with three arms. The two lower arms for tension and the upper compression load caused a "virtual hitch".
Source: Harry Ferguson and the Three-Point Hitch