Licenses issued under this chapter shall be renewable biennially. Each and every dealer's license and dispenser's license required by this chapter shall be conspicuously posted at each location and place of practice at all times as may be required by regulations established by the board. When more than one office or place of business is operated, a duplicate license shall be obtained from the division director for each such location or place regularly carrying on the practice of dispensing hearing aid devices or instruments, upon the payment of an additional appropriate fee for each duplicate license. The address of the location or place of doing business shall be stated on the duplicate license, which shall be posted at the location.