simet piaski, ventilation elements, house ventilation, cooperation, co-operation poland, co operation, services tinplate prcessing, spot welding services, invitation to cooperation, surface to production poland, workforce in poland, duct 165x70 165x80 170x70 170x80 200x80 220x80, elbow 30 45 60 90 165x70 165x80 170x70 170x80 200x80; Instortsystemen, Bocht 1708090, Bocht 2008090, Bocht 220mm, Deksel 220mmx80mm, Deksel 200mmx80mm, Lepe hoek 170mmx80, Lepe hoek 200mmx80mm, Lepe hoek 220x80mm, Flensbus 80mm, Flensbus 100mm, Flensbus 125mm, Flensbus 150mm, Instortpot 100mm, Instortpot 125mm,