Changes made by 74/509/ECSC: Commission Decision of 2 October 1974 authorizing the formation by Société Nouvelle des Aciéries de Pompey, Compagnie Universelle d'Acétylène, Société Française d'Électro-Métallurgie and Société Eurominas Electrometalurgia of a Groupement Européen du Manganèse (Only the French text is authentic)
EU Decision 1974/509
No changes made by 74/509/ECSC: Commission Decision of 2 October 1974 authorizing the formation by Société Nouvelle des Aciéries de Pompey, Compagnie Universelle d'Acétylène, Société Française d'Électro-Métallurgie and Société Eurominas Electrometalurgia of a Groupement Européen du Manganèse (Only the French text is authentic) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.