18So far as concerns, thirdly, periods of service completed after the adoption, by the pension scheme concerned, of measures reinstating equal treatment, Article 119 of the EC Treaty does not preclude the advantages of the persons previously favoured from being reduced to the level of the advantages of the persons previously within the disadvantaged category, that provision requiring only that men and women should receive the same pay for the same work without imposing any specific level of pay (see, to that effect, judgments of 28 September 1994, Coloroll Pension Trustees, C‑200/91, EU:C:1994:348, paragraph 33; of 28 September 1994, Avdel Systems, C‑408/92, EU:C:1994:349, paragraph 21; and of 28 September 1994, van den Akker, C‑28/93, EU:C:1994:351, paragraph 19).
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