Each person to whom a City license has been issued shall keep such license conspicuously posted upon or within the premises to which such license relates. Each licensee, having no fixed place of business, shall carry his license upon his person at all times, while engaging in the licensed business or any transaction incidental thereto, and shall display such license upon request of any person with whom he is transacting business or any law enforcement officer.
(1977 Code 5-107.)