SECTION 4

1. All necessary measures, including the provision of appropriate penalties,. shall be taken by the competent authority to ensure the effective enforcement of the provisions of this Convention. 2. Each Member which ratifies this Convention undertakes either to maintain an appropriate inspection service for the purpose of supervising the application of the provisions of the Convention or to satisfy itself that appro- priate inspection is carried out. 3. National laws or regulations shall define the persons responsible for compliance with the provisions of this Convention. 4. The employer shall keep, and make available to inspectors, records indicating, in respect of persons who are employed or work underground and who are less than two years older than the specified minimum age— (a) the date of birth, duly certified wherever possible ; and (b) the date at which the person was employed or worked underground in the undertaking for the first time. 5. The employer shall make available to the workers' representatives, at their request, lists of the persons who are employed or work underground and who are less than two years older than the specified minimum age ; such lists shall contain the dates of birth of such persons and the dates at which they were employed or worked underground in the undertaking for the first time.