Holders of certificates of registration issued under this chapter shall display the same in a prominent place at their places of business and, upon demand, shall give the number of the certificate of registration to any person who shall demand the same. If any certificate of registration is lost, defaced or destroyed, the registrant may obtain a duplicate upon application to the director and payment of a fee of three dollars ($3.00). (1975 L.M.C., ch. 5, § 1.)