Various patents on the John Deere chopper

Yield measurement: Below is the link to a patent that describes the yield measurement in the forage harvester using torque measurement on the accelerator:


Intake auger: Here is the patent for the intake auger of the current Kemper pick-up with these specially shaped coil ends:


A flap in the drum housing intended to eject a stone that has been drawn in (position 43 on the drawing):