9 Control apparatus in the nature of electronic controllers and control plants being electronic control systems for machines, in particular for use with dust removing plants, bio-filters, dust boxes, jet filters, filters, wet scrubbers, cartridge filters, process gas filters, vibrating filters, spray towers, reverse air filters, dry filters, venturi scrubbers, cyclones, conveyor systems, in particular waste conveyor systems, granule conveyor systems, plastics conveyor systems, mechanical conveyor systems, paper conveyor systems, pellet conveyor systems, pneumatic conveyor systems, product waste conveyor systems, secondary fuel conveyor systems, chip conveyor systems, dust conveyor systems, cellulose conveyor systems, separators, air separators, exhaust air treatment plants, in particular absorption plants, extraction plants for workplaces, extraction plants for bathrooms, steam extraction plants, odour removal plants, solvent extraction plants, oil vapour and emulsion vapour extraction plants, process gas extraction plants, exhaust gas extraction plants, welding gas extraction plants, heat extraction plants, air suction machines, suction machines for industrial purposes, workplace protection booths, workplace protection tables, impellers, rotors, comminution plants for product waste, recycling plants, in particular construction waste recycling plants, electric recycling plants, electronic recycling plants, vehicle recycling plants, compost recycling plants, plastics recycling plants, metal recycling plants, paper recycling plants, production waste recycling plants, secondary fuel recycling plants, super absorbent recycling plants, non-woven material recycling plants, cellulose recycling plants, pneumatic conveyers, conveying machines, conveyor systems, blowing machines for exhaustion of dust, blowing machines for the compression, exhaustion and convey of gases, sorting machines for industry, separators, screen separators, presses, in particular waste compacting machines, magnetic separators, thermal solvent oxidation plants, impellers for the transport of gases; measurement tools, namely, instruments for measuring length, laser measuring systems, distance measuring apparatus; electric apparatus for commutation, namely, commutators being part of electrical switches; safety equipment, namely, workplace protection booths for use in sheltering workers from machinery malfunction and other workplace hazards; and workplace protection tables for use in sheltering workers from machinery malfunction and other workplace hazards