With regard to paid leave for a worker who, from among the workers employed in a business prescribed in Article 133 of the new Act who are in continuous service on April 1, 1991, has as the base date as of that day a day other than April 1, from April 1 of that year until the day before the first base date after that day, the provisions of Article 39, paragraphs (1) through (3) of the new Act as applied before the first day of that month with the replacement of terms pursuant to that Article govern.