Judgment of the Court (Sixth Chamber) of 16 May 2019.#Skatteministeriet v Estron A/S.#Request for a preliminary ruling from the Vestre Landsret.#Reference for a preliminary ruling — Common Customs Tariff — Tariff classification — Hearing aid connectors — Parts and accessories — Combined Nomenclature — Subheadings 8544 42 90, 9021 40 00 and 9021 90 10.#Case C-138/18.