At the time of the first judgment of this established case law (Costa/ENEL,15 July 1964, Case 6/641 (1) there was no mention of primacy in the treaty.
Tráth tugtha chéad bhreithiúnas an chásdlí shocair sin (Costa/ENEL, an 15 Iúil 1964, Cás 6/64 (1)) níor luadh tosaíocht sa Chonradh.