Article 6. If the amount of an invalidity pension calculated in accordance with the provisions of Art.2 through the preceding Article exceeds 30,000 yen in an invalidity pension granted to a person qualified for such pension on account of his disability coming within the first class of degree of disability as stipulated in Annexed Table No.1 of the Welfare Pension Insurance Law or to an invalidity pensioner of the first class under the former Law, and 24,000 yen in an invalidity pension granted to a person qualified for such pension on account of his disability coming within the second class of degree of disability as stipulated in Annexed Table No.1 of the Welfare Pension Insurance Law or to an invalidity pensioner of the second class under the former Law, the amounts of such pensions shall be 30,000 yen or 24,000 yen respectively, regardless of the provisions of those Articles.