The gas fitters examining board shall conduct examinations for the purpose of determining the competency of applicants who are required to have a license under this chapter and chapter 7, title 3 of this code, and to issue certificates of competency to such persons as may be entitled thereto. The board shall elect a chairperson from its members, who shall be the executive officer and preside at all meetings, and a secretary, who shall keep such records as are proper for efficient discharge of the board's duties, which records pertaining to an applicant's qualifications shall be kept intact and available in the event of dispute for a period of not less than one year following the date of issuance of the certificate of competency. The board shall determine the character and extent of the examination based on the requirements of this code, and shall grade and pass or reject the applicant on the basis of equaling or exceeding, or failing to equal, a minimum percentage grade of seventy percent (70%). The board shall issue certificates of competency to successful applicants and shall have the power to revoke such certificates under conditions hereinafter prescribed. (Ord. 172, 1-9-1957)