Threshing service, Big Beaver Borough, Pa. Bob Davenport: Steam tractor looks similar to my grandfather’s (George Barclay). He used to travel from farm to farm to do their threshing. If you look in the background of the picture, you can see the old Owens Farm, and you can see Shenango Road where it turns and goes up the hill. The picture was taken on the old Dusty Patterson Farm. Date: unknown. Source: Bob Davenport.