Nothing contained in this chapter shall be construed as imposing a license tax on or otherwise relating or restricting any business which is made exempt therefrom by the Constitution of the state or any statute of the state, including any person exclusively engaged in the manufacture, sale, purchase, possession or transportation of intoxicating liquors or as an insurance agent or broker or doing express business on any railroad or stage line or as a telegraph or telephone company, or in the transmission or sale of electricity, or as a bank, including national banking associations, or as a commercial traveler whose business is limited to goods, wares and merchandise sold or dealt in at wholesale. (Ord. 89-12 (part), 1989)