If it is necessary for a worker receiving vocational training which has received recognition as provided for in Article 24, paragraph (1) of the Vocational Ability Development and Promotion Law (Act No. 64 of 1969) (including as applied mutatis mutandis under Article 27-2, paragraph (2) of that Act), the provisions of Article 14, paragraph (1) concerning the contract period, the provisions of Articles 62 concerning restrictions on dangerous and hazardous operations for minors, the provisions of Article 64-3 concerning restrictions on dangerous and hazardous operations for expectant and postpartum mothers and others, the provisions of Article 63 concerning the ban on belowground labor by minors, and the provisions of Article 64-2 concerning limitations on belowground work by expectant and postpartum mothers may be otherwise provided for by Order of the Ministry of Health, Labour and Welfare to the extent that this is necessary; provided, however, that with respect to the ban on belowground labor by minors referred to in Article 63, this does not apply to persons under 16 years of age.