(( Filters for cleaning cooling air for engines; )) filters for cleaning cooling air for machines used for cutting and processing machines in the metalworking operations; filters for cleaning oil mist, oil smoke and dust, being parts of grinding machines, cutting machines, turning machines, die casting machines, heat treatment machines and forming machines used in metalworking operations; dust filters being parts of welding machines, cutting machines and grinding machines used in dry and/or n...

Building construction; installation and repair of filtering equipment for oil mist, oil fumes and dust; installation and repair of ventilation systems