DMAI vs

The Supreme Court held that under Section 33C(2) of the Industrial Disputes Act, 1947, workmen cannot claim higher wages based solely on performing similar duties to a senior grade unless they have been duly promoted. The Court emphasized that a claim for reclassification or promotion must be made under Section 10 of the Act, and without such promotion, the claim for higher wages is not maintainable. The appeal was dismissed as the appellants had not been promoted to 'B' Grade Fitters, thus lacking the requisite right to claim the higher salary.