Combines

John Deere released the No. 2 Harvester in in 1927, and followed a year later with the No. 1 Harvester. By 1930 John Deere had released new hillside models able to harvest on up to a 50% gradient.
The first slef-propelled combine was the Model 55, released in 1947. In the mid-1950s John Deere introduced attachable corn heads, allowing farmers to cut, shell, and clean corn in one operation.
In 1970 John Deere released the "New Generation" of combines, including the 3300, 4400, 6600, and 7700. These models were the first to include the Quik-Tatch header mount.
In 1999 John Deere introduced the Single-Tine Seperation (STS) system. The STS system used less power and improved material handling, several STS models were created, including the 9760, 9770, 9870.
In 2010 John Deere Harvester Works produced its 500,000th self-propelled combine.