Sec. 7766-5. A record giving all the facts contained in every age and schooling certificate issued shall be kept on file in the office issuing the same; and also a record of the names and addresses of the children to whom certificates have been refused, together with the names of the schools and grades which such children should attend and the reasons for the refusals; and also a record of all certificates returned or no longer used, as provided in sections 7766-1, (1), 7766-6 or 7766-9, General Code, with the reasons therefor, and the subsequent assignment of the child to a school, if any; and also a record of the conditions on which any certificates were issued, and there shall be kept on file also the pledges given in connection therewith; and also a record of the special facts connected with the issuing of "retarded" or limited certificates. The superintendent of public instruction shall have the power to prescribe methods of filing of all such facts, records and papers, for purposes of effective reference. The above-named record is nevertheless not required in the cases of certificates denied to those determined immediately at the time of inquiry to be of insufficient age. Sec. 7766-6. The superintendent of schools may issue a vacation certificate to a boy or girl under eighteen years of age and over fourteen years of age which shall permit him to be employed within the restrictions of other statutes during the summer school vacation up to August 25th, in occupations not forbidden by sections 13001, 13002 or 13007-3, General Code, to children of his age and sex, regardless of what schooling he has completed, but before such certificate is issued the requirements prescribed in section 7766-1 with relation to health, written pledge of employment, and proof of age must be complied with. Such vacation certificate shall be printed on blue or blue-tinted paper and the word "vacation" shall be printed or stamped across its face; such certificate shall include a statement of the school and grade in which the child is enrolled. Such certificates must be returned to the superintendent of schools by employers within the same period and under the same penalties as regular age and schooling certificates and may be revoked by the superintendent of schools at any time because of the physical condition of the child or other sufficient cause. If a child who desires a vacation age and schooling certificate secures only a limited health certificate the word "limited" shall be written or stamped across the face of the vacation certificate and the limited vacation certificate shall be on blue or blue-tinted paper; in which case the certificate shall show to what employment it is limited.