art_139__para_3__point_a__text_1
by reference to European standards, or to European technical approvals or common technical specifications, where such exist, to international standards, to other technical reference systems established by European standardisation bodies or, failing this, their national equivalents; every reference shall be followed by the expression ‘or equivalent’;
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Source: EUR-Lex (Cellar) · retrieved 2026-11-04 · Text as adopted (Official Journal); later amendments are not incorporated in this text.