Case T-340/18: Judgment of the General Court of 28 June 2019 — Gibson Brands v EUIPO — Wilfer (Shape of a guitar body) (EU trade mark — Invalidity proceedings — EU three-dimensional mark — Shape of a guitar body — Absolute ground for refusal — Distinctive character — Article 52(1)(a) of Regulation (EC) No 207/2009 (now Article 59(2)(a) of Regulation (EU) 2017/1001) — Distinctive character acquired through use — Article 52(2) of Regulation No 207/2009 (now Article 59(2) of Regulation 2017/1001))