37 [ Installation, repair and maintenance of machines and apparatus for pumping, cartridges for filtering machines, control mechanisms for machines or engines, injectors for agricultural implements and machines, automatic distributors, mechanized livestock feeders, filtering machines, filters, pumps, feed water regulators, regulators for machines, apparatus and instruments for dosing, measuring, weighing, dosing pumps, liquid level gages, dosing pumps for medical, surgical, veterinary equipment, injection apparatus in the medical, surgical, veterinary fields, instruments and apparatus for the distribution of water and liquid, apparatus and instruments for agricultural irrigation and animal husbandry, apparatus and installations for filtering and water treatment, drip diffusers, drip diffusers of water or liquids; providing information in the field of installation and maintenance of machines and apparatus for pumping, cartridges for filtering machines, control mechanisms for machines or engines, injectors for agricultural implements and machines, automatic distributors, mechanized livestock feeders, filtering machines, filters, pumps, feed water regulators, regulators for machines, apparatus and instruments for dosing, measuring, weighing, dosing pumps, liquid level gages, dosing pumps for medical, surgical, veterinary equipment, injection apparatus in the medical, surgical, veterinary fields, instruments and apparatus for the distribution of water and liquid, apparatus and instruments for agricultural irrigation and animal husbandry, apparatus and installations for filtering and water treatment, drip diffusers, drip diffusers of water or liquids; cleaning of machines ]