Agricultural machinery and attachments therefor, namely, rotary mowers, box scrapers, and three-point attachments; Agricultural machinery and attachments, namely, fertilizer spreaders; Agricultural machinery, namely, combines; Agricultural machinery, namely, harvesters; Agricultural machinery, namely, threshers; Agricultural machinery, namely, tillers; Agricultural machinery, namely, windrowers; Seed drills for agricultural machines; Agricultural seed planting machine; Agricultural seed planting machines, namely sowers; Agricultural implements, namely, seed drills; Containers for use with mechanical spreaders, namely, cartridges, bags, and pouches for seed, lawn fertilizers, pesticides and other chemicals; Machines for use in agriculture, namely, self-propelled seed sowers and self-propelled seed sowers combined with earth moving equipment; Mechanical spreaders for seed and dry lawn chemicals; Self-lubricating mechanical friction parts, especially of composite materials, namely, wear rings, washers, bushings, spherical bearings, bearing pads, sliding blocks and machine transmission gears all for load bearing machines, conveyors, handling trucks and machines, lifting machines, agricultural machinery, construction equipment machines and hydraulic turbines