Changes made by 77/286/EEC: Commission Decision of 5 April 1977 allowing admission free of Common Customs Tariff duties of scientific apparatus for measuring emissions of pollutants in the atmosphere
EU Decision 1977/286
No changes made by 77/286/EEC: Commission Decision of 5 April 1977 allowing admission free of Common Customs Tariff duties of scientific apparatus for measuring emissions of pollutants in the atmosphere are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.