Amendment to Section 35C restricts clause (a) to entries after 29 February 1968 but before 1 March 1984. Amendment adds an upper temporal limit to clause (a) of sub section (1) of section 35C, inserting the words 'but before the 1st day of March, 1984' immediately after the existing phrase 'after the 29th day of February, 1968', thereby confining the operative period of that clause to dates after 29 February 1968 and before 1 March 1984.