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CN2809
28 Inorganic Chemicals, Organic or Inorganic Compounds of Precious Metals, of Rare-earth Metals, of Radioactive Elements or of Isotopes
2809 (01/1988-..) Diphosphorus Pentaoxide, Phosphoric Acid, Polyphosphoric Acids, Whether or not Chemically Defined
28091000 (01/1988-..) Diphosphorus Pentaoxide
28092000 (01/1988-..) Phosphoric Acid, Polyphosphoric Acids, Whether or not Chemically Defined