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colonne a piatti per lo scambio acqua-idrogeno solforato e ’contattori interni’, come segue:
water-hydrogen sulphide exchange tray columns and "internal contactors", as follows:
’contattori interni’ delle colonne a piatti per lo scambio acqua-idrogeno solforato specificate in 1b229.a.
"internal contactors" for the water-hydrogen sulphide exchange tray columns specified in 1b229.a.