Saving of acquisition laws preserves state power to acquire estates and modify property rights despite fundamental rights challenges. Laws providing for State acquisition of estates or rights, temporary state management of property, corporate amalgamation, extinguishment or modification of managerial or shareholder rights, and alteration or termination of mineral agreements are protected from invalidation as abridging certain fundamental rights. State laws enjoy that protection only upon reservation for and assent by the President. Compulsory acquisition of personally cultivated land within ceiling limits is barred unless the law mandates compensation not less than market value. 'Estate' and 'rights' are defined to include local tenure forms, agricultural and ancillary land, and proprietary and revenue-related interests.