7 mechanical installations for handling of bulk materials, their parts and accessories, namely, conveyors, dust separators, mechanical mixing machines, discharge units as components of the aforementioned installations for draining bulk goods from containers; valves, namely, slide valves, flap valves, diverter valves and rotary valves and air filters forming part of the aforesaid machinery; distribution devices, namely, pipes, tubes and hoses; pumps and blowers for the pressure-conveying of granulated, powdered and fluid materials and parts therefor; compressors for machines and cyclone and counterflow separators and parts therefor