Title: Reaper
Content:  granted, the McCormick Reaper was patented by his son Cyrus McCormick in 1834 as a horse-drawn farm implement to cut small grain crops. This McCormick reaper machine had several special elements: Cyrus McCormick claimed that his reaper was actually invented in 1831, giving him the true claim to the general design of the machine. Over the next few decades the Hussey and McCormick reapers would compete with each other in the marketplace, despite being quite similar. By the 1850s, the original patents of both Hussey and McCormick had expired and many other manufacturers put similar machines on the market. In 1861, the United States Patent and Trademark Office issued a 
Title: Cyrus McCormick Farm
Content:  smoked to preserve it through the winter. Refrigeration was not introduced until the late 19th century. The McCormick family also maintained a school on their property for neighboring children. The McCormick Farm at Walnut Grove is known as the birthplace of the mechanical reaper, the predecessor to the combine harvester. Cyrus McCormick reportedly designed, built, and tested his reaper all within six weeks at Walnut Grove, although the design may have been merely an improvement upon the similar device developed by his father and his brother Leander over 20 years. Shortly after constructing his first reaper he went on to harvest his first crop with 
Title: Cyrus McCormick
Content:  Cyrus Hall McCormick (February 15, 1809 – May 13, 1884) was an American inventor and businessman who founded the McCormick Harvesting Machine Company, which later became part of the International Harvester Company in 1902. Originally from the Blue Ridge Mountains of Virginia, he and many members of the McCormick family became prominent residents of Chicago. McCormick has been simplistically credited as the single inventor of the mechanical reaper. He was, however, one of several designing engineers who produced successful models in the 1830s. His efforts built on more than two decades of work by his father Robert McCormick Jr., with the aid of Jo Anderson, who was enslaved by the family. He also successfully developed a modern company, with manufacturing, marketing, and a sales force to market his products.
Title: Reaper
Content:  with each other, and were the subject of several lawsuits. Obed Hussey in Ohio patented a reaper in 1833, the Hussey Reaper. Made in Baltimore, Maryland, Hussey's design was a major improvement in reaping efficiency. The new reaper only required two horses working in a non-strenuous manner, a man to work the machine, and another person to drive. In addition, the Hussey Reaper left an even and clean surface after its use. The McCormick Reaper was designed by Robert McCormick in Walnut Grove, Virginia. However, Robert became frustrated when he was unable to perfect his new device. His son Cyrus asked for permission to try to complete his father's project. With 
Title: Reaper
Content:  after it was patented by Cyrus McCormick. This was because the McCormick reaper lacked a quality unique to Obed Hussey's reaper. Hussey's reaper used a sawlike cutter bar that cut stalks far more effectively than McCormick's. Only once Cyrus McCormick was able to acquire the rights to Hussey's cutter-bar mechanism (around 1850) did a truly revolutionary machine emerge. Other factors in the gradual uptake of mechanized reaping included natural cultural conservatism among farmers (proven tradition versus new and unknown machinery); the poor state of many new farm fields, which were often littered with rocks, stumps, and areas of uneven soil, making the lifespan and operability of a reaping machine questionable; 
Title: Cyrus McCormick
Content:  A few machines based on a design of Patrick Bell of Scotland (which had not been patented) were available in the United States in these years. The Bell machine was pushed by horses. The McCormick design was pulled by horses and cut the grain to one side of the team. Cyrus McCormick held one of his first demonstrations of mechanical reaping at the nearby village of Steeles Tavern, Virginia in 1831. He claimed to have developed a final version of the reaper in 18 months. The young McCormick was granted a patent on the reaper on June 21, 1834, two years after having been 
Title: Obed Hussey
Content:  machines had been granted before that of Hussey, the earliest in 1803; however, Hussey's was the first "really practical" reaping machine to be patented. As for McCormick, although he built and used a reaper in 1831, he did not patent it until 1834, about six months after Hussey's patent, nor had he sold reapers to others. Instead, after obtaining the patent, McCormick turned his attention to other business matters, selling no reapers until at least 1839. As of 1834, McCormick's reaper was still marginal, while Hussey's machine was a viable reaper. Hussey gave successful demonstrations of his machine in 1834 in New York state and in 1835 in Missouri, New York state, and 
Title: Cyrus McCormick
Content:  Cyrus McCormick was born on February 15, 1809 in the Shenandoah Valley of Virginia. He was the eldest of eight children born to inventor Robert McCormick Jr. (1780–1846) and Mary Ann "Polly" Hall (1780–1853). As Cyrus' father saw the potential of the design for a mechanical reaper, he applied for a patent to claim it as his own invention. He worked for 28 years on a horse-drawn mechanical reaper to harvest grain; he was never able to reproduce a reliable version, however. Building on his father’s years of development, Cyrus took up the project aided by Jo Anderson, an enslaved African-American on the McCormick 
Title: Robert McCormick (Virginia inventor)
Content:  Robert McCormick Jr. (June 8, 1780 – July 4, 1846) was an American inventor who invented numerous devices including a version of the reaper which his eldest son Cyrus McCormick patented in 1834. Although he lived his life in rural Virginia, he was patriarch of the McCormick family that became influential throughout the world, especially in large cities such as Chicago, Washington, D.C. and New York City.
Title: Cyrus McCormick Farm
Content:  and cheaper than older reapers. Prior to inventing the reaper, farmers could only harvest 0.5 acre a day; after the reaper was invented, farmers could harvest 12 acre a day using less manual labor. The mechanical reaper did not require a family to toil all day to harvest crops. Instead, a single farmer merely operated the machine and the reaper would do the rest of the work. His work in mechanical reapers and harvesting techniques allowed farmers to cultivate plots of land bigger than ever thought possible. In 1902, the company was merged with competitor Deering Harvester Company and (smaller ones) to form International Harvester.

Question: when was the reaper invented by cyrus mccormick?
Answer: 1837.
1834.