§ 4-38 CONTRACTORS AND JOURNEYMEN.
   No person, firm or corporation shall engage in business as a plumbing contractor, nor shall any person work as a journeyman plumber, until the person, firm or corporation has become properly registered with the city, and has furnished the city satisfactory evidence of compliance with the laws of the state, and satisfactory evidence of responsibility and skill as provided by the ordinances of the city.
(`90 Code, § 4-15)