Example of value engineering in tractors?

Engineering in tractors can easily be seen with all modern tractors basically being seen with 4wd and a cab with air conditioning. The best way to track engineering is through the John Deere Combine. In the sixties it was all manualy adjusted then seventies some adjustments were moved to the cab. Eighties more adjustments were moved into the cab but you still had to moniter the dirt in the grain and how much grain was being lost. The nineties brought sensors tracking the amount of grain lost and it can be adjusted in the cab. The newest models have sensors and adjustments all connected to a computer and the computer tracks grain loss and makes adjustments without operator imput.