9
cathodic protecting devices used for preventing deterioration and rusting in pipes and other underground metal structures; water meters; data processors; blank computer disks; computers; computer hardware; computer software and programs all relating to the organization and management of water supply and sewerage operations, and related accounting and billing systems; and the parts therefor
37
providing the services of sewerage transportation and dumping of sewerage wastes for others
39
public utility in the nature of water supply services, and consultancy and management services related to water supply and sewerage services
42
consultation in the field of engineering, water surveying, laboratory research and testing of water supplies, drilling of boreholes for locating water supply sources, waste management services, waste disposal and incineration for others, computer software design and programming for others
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