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Grains for deburring, polishing and cleaning, polishing substances, cleaning preparations, products for the chemical treatment of surfaces. Assembly devices used for handles with rigid devices, clamping collars for handles, couplings for handles, connection tubes for handles, tightening straps of metal, closing links and tightening devices, bindings for handles, particularly for handles for fire brigades, quick- connect couplings for tubes and handles, including with automatic and non-automatic cutoff means; all said goods of metal; trestles, easels, ridges, frameworks, transport containers and parts of these objects, all of metal, particularly for dismantable objects and block construction system components. Devices and tools for inserting couplings in handles and for tightening clamping collars for handles, devices and tools for assembly purposes, including motorized devices and tools; gas and liquid valves for machines; transport devices of metal and their parts, in particular for dismantable objects and objects block construction system components; deburring and polishing machines. Devices and tools for inserting couplings in handles and for tightening clamping collars for handles, devices and tools for assembly purposes. Metal carts for transport and their parts for the sick or injured. Metal carts for transport and their parts, in particular for dismantable objects and building block system components; engine brakes with exhaust valves. Suspension-type files for office use.