Judgment of the Court (Sixth Chamber) of 10 February 2000 in Case C-50/96 (reference for a preliminary ruling from the Landesarbeitsgericht Hamburg): Deutsche Telekom AG v Lilli Schröder (Equal pay for men and women — Article 119 of the EC Treaty (Articles 117 to 120 of the EC Treaty have been replaced by Articles 136 EC to 143 EC)— Protocol concerning Article 119 of the EC Treaty — Occupational social security schemes — Exclusion of part-time workers from a supplementary occupational retirement pension scheme — Retroactive membership — Entitlement to a pension — Relationship between national law and Community law)