Changes made by 78/597/EEC: Commission Decision of 16 June 1978 completing the Commission Decision of 13 May 1977 allowing admission free of Common Customs Tariff duties of scientific apparatus described as 'Lock-in-amplifier, PAR model 186 A with internal oscillator, PAR, model 186A/99/97, optional'
EU Decision 1978/597
The legislation 78/597/EEC: Commission Decision of 16 June 1978 completing the Commission Decision of 13 May 1977 allowing admission free of Common Customs Tariff duties of scientific apparatus described as 'Lock-in-amplifier, PAR model 186 A with internal oscillator, PAR, model 186A/99/97, optional' changes, newest first. Choose one to see each change.
From legislation.gov.uk's record of changes, the official one: see it there.