31022 -Ammonium sulfate; Double salts and mixtures of ammonium sulfate and ammonium nitrate: HS code chinese tariffs

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31022100 --Ammonium sulfate --Ammonium sulfate

31022900 --Double salts and mixtures of ammonium sulfate and ammonium nitrate --Double salts and mixtures of ammonium sulfate and ammonium nitrate