Fuller & Johnson made several sizes of feed mills to go with their engines.  While mentioned in dealer correspondence and having their own ad bulletin they were not listed in catalogs and were not widely advertised.  While other competitors like Stover, New Holland and IHC advertised and sold a good number of their own mills, F&J seems to have preferred to focus on refining their gas engine designs.  Finding a F&J feed mill today is a difficult task because of this.