4. 1st January, 1955, vide notification No. S.R.O. 3606, dated 17th December, 1954, published in the Gazette of India, Extraordinary, P art II, Section 3. The Act h as been extended to State of Sikkim vide notification No. S. O. 1629(E) , dated 15th April 2021 , see Gazette of Ind ia, Extraordinary , Part II, se c. 3 (ii).