37-42-306. Issuance of operator certificate -- display. (1) The department shall issue certificates attesting to the competency of operators. The certificates shall include the classification of the works which the operator is qualified to supervise.

(2) The certificate shall be prominently displayed in the office of the operator.

(3) Certificates continue in effect unless revoked by the department but remain the property of the department, and the certificate shall so state. A certificate shall be renewed annually by payment of the proper fee.