7 Agricultural machinery, namely, cultivators, planters, windrowers, shredders, earth scrapers, round bale movers, round bale feeders, roller mills, ear corn mills, forager blowers, tub grinders, guidance systems for agricultural implements, namely, steering and positioning devices for causing an implement to stay on course relative to row crops, rolling stalk choppers, and tool bars adapted to be mounted to a tractor and supported by a tractor for carrying row units for cultivators or planters