Changes to ECSC High Authority: Décision No 21-63 of 11 December 1963 amending Décision No 37-54 of 29 July 1954 on the publication of price lists and conditions of sale applied by undertakings in the steel industry to the sale of special steels
EU Decision 1963/21
No changes to ECSC High Authority: Décision No 21-63 of 11 December 1963 amending Décision No 37-54 of 29 July 1954 on the publication of price lists and conditions of sale applied by undertakings in the steel industry to the sale of special steels are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.