law: 4. Validation of certain transfers.-
  A subsidiary company which was operating, or was in control of, any coal mine, coking coal mine, or coke oven plant which was vested in the Coal India or any other subsidiary company immediately before the commencement of this Act, shall be deemed to have been vested with the land or rights in or over such land or the right, title and interest in relation to such coal mine, coking coal mine or coke oven plant and such vesting shall be deemed to have been valid and effective at all material times as if a direction had been made by the Central Government under sub-section (1) of section 3 and accordingly no suit or other proceeding shall be instituted, maintained or continued in any court on the ground that such subsidiary company was not competent to operate or control such coal mine, coking coal mine or coke oven plant.