One and two centrifugal fans, roof fans, drum fans, axial - flow fans,double-inlet drum centrifugal fans type WPBD, fans type WWOax, Jad-type counter - flow heat exchangers, Heating - Ventilating apparatures: to be mounted on walls, to be mounted on walls or ceilings with axial - flow fans, for intake conditions, frame type; a wind-driven roof vent type A, fan unit type KWM, duct fans type WK, medium-pressure centrifugal fans type WSP, heating coils for coil boiler heat exxhangers, louvers, cyclone CT, cyclone bases CT, angle bending machines, uniwersal folding machines, heating and ventilation units for ducted applications,heating cartridges for capacity heat exchangers, sheet formers, mechanical rim forming machines, cutting and shaping of ship metal (bending, stamping, cutting out, die shearing, etc.), welding of carbon and austenitic steels, and of aluminium (TIG, MIG), machining (turning, milling, grinding, drilling, and chiselling), design and execution of ventilation installations on industrial premises, roof exhaust vent type D