21As a preliminary point, it should be noted that, when the Court is requested to give a preliminary ruling on a matter of tariff classification, its task is to provide the referring court with guidance on the criteria which will enable it to classify the products concerned correctly in the CN, rather than to effect such a classification itself, That classification results from a purely factual assessment which it is not for the Court to make in the context of a reference for a preliminary ruling (see, to that effect, judgment of 18 June 2020, Hydro Energo, C‑340/19, EU:C:2020:488, paragraph 33 and the case-law cited).
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