Changes made by Council Directive of 17 May 1979 on the approximation of the laws of the Member States relating to the coupling device and the reverse of wheeled agricultural or forestry tractors (79/533/EEC)
EU Directive 1979/533
No changes made by Council Directive of 17 May 1979 on the approximation of the laws of the Member States relating to the coupling device and the reverse of wheeled agricultural or forestry tractors (79/533/EEC) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.