Welding; manual and computer numerical control (CNC) machining; heat treatment; grinding; profile cutting; plasma cutting; shot blasting; custom manufacture of goods; leasing, rental and hiring of water treatment units, water treatment apparatus, installations for the treatment of water, waste water treatment apparatus, apparatus for the removal of suspended solids from a liquid, devices for the separation of impurities from water and installations for the separation of liquids; leasing, rental and hiring of machines for processing waste, machines for sorting rubble, silt, sand, gravel, rock, stone or organic material, machines for grading rubble, silt, sand, gravel, rock, stone or organic material and trommels; custom manufacture of vehicles, excavators, power operated machines, construction machines, machines for processing waste, machines for sorting rubble, silt, sand, gravel, rock, stone or organic material, machines for grading rubble, silt, sand, gravel, rock, stone or organic material, trommels and parts and fittings for the aforementioned goods; custom manufacture of effluent treatment installations to separate water from contaminants, devices for the separation of oil from water, effluent treatment machines to separate water from contaminants, water treatment units, water treatment apparatus, installations for the treatment of water and parts and fittings for the aforementioned goods; custom manufacture of waste water treatment apparatus, apparatus for the removal of suspended solids from a liquid, devices for the separation of impurities from water, installations for the separation of liquids and parts and fittings for the aforementioned goods; information and advisory services connected with the aforementioned services