The validity of this levy of cess was challenged by the petitioner coal company in the Hingir Rampur case as ultra vires the powers of the State Legislature because (a) the cess was not a fee but a duty of excise on coal which was a field covered by Entry 84 of List I in the Seventh Schedule and repugnant to the Local Mines Labour Welfare Fund Act, 1947 (Central Act XXXII of 1947); and (b) even if it was treated as a fee relatable to Entries 23 and 66 of List II in the Seventh Schedule, it was hit by Entry 54 of List I read with the Mines and Minerals (Development & Regulation) Act, (Central Act LIII of 1948) (`the MMRD Act ' for short) or by Entry 52 of List I read with the Industries (Development and Regulation) Act (`the IDR Act ' for short), 1951 (Central ACt LXV of 1951).