The Arcus was originally invented (circa mid-80's) by a plant biologist_pathologist named Dr. Hege, known for the invention and mfg. of innovative plot combines and planters, in the South (Bavaria region) of Germany. The Arcus was later manufactured by MDW in Dresden, Germany prior to and after being purchased by CaseIH. It truely was an innovative machine with a huge appetite for small grains and wasn't too bad in corn either (it made it to the states). Threshing was performed in the feederhouse by two twin axial rotors that conformed to the movements and pitch of the feederhouse. Grain was then conveyed to a twin level (but separate) cleaning shoe by four augers (two to the top shoe and two to the bottom shoe) where the grain would cascade through for efficient cleaning. Then, CIH decided to overthrow the designer_product manager, committing corporate mutiny, forcing him out so to try there hand at expanding on innovation. Unfortunately, they were not successful and brought it to is knees (couldn't leave well enough alone). This ultimately brought about the Arcus' demise. Only about 2 dozen red ones were produced, ultimately to be pulled back to the MDW factory for rework and never moved, as far as I know. There are however, a few blue ones still operating and operating very well. Amazing what amature ingenuity and innovation can do! Really makes the corporate world jealous, especially when they spend millions to result in a flop.