(820 ILCS 205/15) (from Ch. 48, par. 31.15)
    Sec. 15. Any certificate duly issued in accordance with this Act shall be prima facie evidence of the age of the minor for whom issued in any proceeding involving the employment of the minor under the Child Labor Law of the State, as to any act occurring subsequent to its issuance, or until revoked.
(Source: Laws 1945, p. 754.)