Changes made by 77/380/EEC: Commission Decision of 23 May 1977 excluding from admission free of Common Customs Tariff duties the scientific apparatus described as 'two-phase/vector lock-in-amplifier' PAR model 129 A
EU Decision 1977/380
No changes made by 77/380/EEC: Commission Decision of 23 May 1977 excluding from admission free of Common Customs Tariff duties the scientific apparatus described as 'two-phase/vector lock-in-amplifier' PAR model 129 A are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.