Commission Directive 81/334/EEC of 13 April 1981 adapting to technical progress Council Directive 70/157/EEC on the approximation of the laws of the Member States relating to the permissible sound level and the exhaust system of motor vehicles
OJ L 131, 18.5.1981, p. 6–27 (DA, DE, EL, EN, FR, IT, NL)
