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Subheading ใน heading นี้
HS 690210Containing by weight, singly or together, more than 50 % of the elements Mg, Ca or Cr, expressed as MgO, CaO or Cr2O3HS 690220Containing by weight more than 50 % of alumina (AI2O3), of silica (SiO2) or of a mixture or compound of these productsHS 690290Other