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28: Inorganic chemicals, precious metal compound, isotope
2841: Salts of oxometallic or peroxometallic acids
2841: Salts of oxometallic or peroxometallic acids
284110: Metallic aluminates
284120: Chromates of zinc or of lead
284130: Sodium dichromate
284140: Potassium dichromate
284150: Chromates, dichromates, peroxochromates nes
284160: Manganites, manganates and permanganates of metals
284170: Metallic molybdates
284180: Metallic tungstates (wolframates)
284190: Salts of oxymetallic or peroxometallic acids nes
2841: Salts of oxometallic or peroxometallic acids
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