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Chemical elements, inorganic acids and compounds Sodium hypochlorite Construction work for pipelines, communication and power lines, for highways, roads, airfields and ra... Potassium permanganate Postcards Construction, foundation and surface works for highways, roads Sodium hydroxide Foundation work for highways, roads, streets and footpaths Construction work for highways, roads Other services Poly aluminium chloride Hydrogen chloride, inorganic acids, silicon dioxide and sulphur dioxide Nitrates Postcards, greeting cards and other printed matter Inorganic acids Dates

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