Every person or corporation operating in the City a public utility for supplying the inhabitants of the City with heat, electricity, gas or telephone service, and any department of the City operating a Municipally owned or controlled utility, shall supply each and every subscriber or consumer with a card showing a facsimile of the badge worn by his, her or its employees who are authorized to enter dwellings or other buildings for the purpose of reading meters and inspecting equipment, or for any other purpose. Such cards shall also bear the number of the meter or telephone instrument of such consumer or subscriber. All such persons and corporations shall supply all their meter readers, inspectors or such other persons who may be authorized to enter dwellings or buildings with the numbers of such meters and instruments on their respective routes for the purpose of comparison.