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CORROSION INHIBITOR FOR ACID ETCHING BATH IN PARTICULAR THOSE FOR FEMOVING BOILER SCALE AND RUST FROM WATER PIPINGS AND SIMILAR INSTALLATIONS MADE OF STEEL, COPPER AND ALUMINIUM AND METHOD OF OBTAINING SUCH INHIBITOR
CORROSION INHIBITOR FOR ACID ETCHING BATH IN PARTICULAR THOSE FOR FEMOVING BOILER SCALE AND RUST FROM WATER PIPINGS AND SIMILAR INSTALLATIONS MADE OF STEEL, COPPER AND ALUMINIUM AND METHOD OF OBTAINING SUCH INHIBITOR