(d) In case no documentary proof of age can be procured, the superintendent may receive and file an application signed by the parent, guardian or custodian of the child that a physician's certificate be secured to establish the sufficiency of the age of the child. Such application shall state the alleged age of the child, the place and date of birth, his present residence, and such further facts as may be of assistance in determining the age of the child, and shall certify that the person signing the application is unable to obtain any of the documentary proofs specified in (a), (b) and (c) above. If the superintendent of schools is satisfied that a reasonable effort to procure such documentary proof has been without success such application shall be granted and the certificate of the school physician or if there be none, of a physician employed by the board of education, that said physician is satisfied that the child is above the age required for an age and schooling certificate as stated in section 7766, General Code, shall be accepted as sufficient evidence of age. (4) A certificate from the school physician or physician designated by him, or if there be no school physician from the district health commissioner, or physician designated by him, showing after a thorough examination that the child is physically fit to be employed in such occupations as are not prohibited by law for a boy or girl, as the case may be, under eighteen years of age. But a certificate with the word limited written, printed or stamped diagonally across its face may be furnished by the school physician or other person indicated in the above sentence, and accepted by the superintendent of schools in issuing a "limited" age and schooling certificate provided in section 7766-3, General Code, showing that the child is physically fit to be employed in some particular occupation not prohibited by law for a boy or girl as the case may be of the child's age which the child contemplates entering even if the child's complete physical ability to engage in any occupation as required in the preceding sentence cannot be vouched for. Sec. 7766-2. When an age and schooling certificate, returned according to section 7766-1, General Code, is reissued, the pledge of the new employer and certificate from the school physician or other person in his stead shall be secured and filed. Sec. 7766-3. The age and schooling certificate provided in section 7766, General Code, shall be issued only with the word "limited" printed or stamped diagonally across its face if the certificate of the physician provided in section 7766-1 or 7766-2, General Code, is a limited certificate and in that case the particular employment to which it is limited shall be stated in the certificate, and the certificate cannot serve as the legal age and schooling certificate for employment in another occupation. Such limited certificate shall be printed on pink paper.