7 Snow plough blades, being parts of machines; brushes for street sweeping machines, being parts of machines; rails for earth moving machines, being parts of machines; snow ploughs and parts thereof, included in this class; street sweeping machines and parts thereof, included in this class; metal screens, being machines or parts of machines; self-propelled road sweeping machines; street cleaning machines and parts thereof, included in this class; wear plates for screens, being parts of machines; stripper plates, being parts of machines; screen inserts of metal, being parts of machines; bases of metal, being parts of machines