Early 1900's trépigneuse, also known as horse treadmill thresher or horse powered thresher, built by Protte in Vendeuvre, in nice original condition, should be functional with a little tlc. To see how to thresh with a horse in it, look at the second picture or see you tube video taken from the internet: 
https://www.youtube.com/watch?v=cq4WKZXqSBQ 
Would be a lovely addition to any farm museum or horse related collection.