Every person owning and operating taxicabs who obtains a license from the city may adopt any trade name, design, or scheme or method of painting or lettering the taxicabs that is approved by the mayor, which shall include:
(A) A serial body number assigned by the mayor to each taxicab painted or attached on each side and on the rear of the taxicab.
(B) The name of the owner or the trade name under which he does business, painted or attached on each side of the taxicab.
('68 Code, § 52.30) Penalty, see § 111.99