These writ petitions were heard along with Writ Petition (Civil) Nos. 457 and 458 of 1972, pertaining to the acquisi tion of Tinsukhia Electric Supply Co. Ltd., and Dibrugarh Electric Supply Co. Ltd., under the provisions of the Tin sukhia and Dibrugarh Electric Supply Undertakings (Acquisi tion)Act, 1973, (Assam Act 1973) and the main contentions touching the constitutionality of such State laws, providing for acquisition of private electricity undertakings inde pendently of and without recourse to the option to purchase envisaged by the terms of licences and under the provisions Sections 6, 7 and 7A of the Electricity Act 1910 are con sidered in the main judgment in the said WP 481 Nos. 457 & 458, separately rendered today.