Section 20-307. Exemptions

a. Members of city, state or federal departments,
  who  are  assigned  to  locksmith  work  wholly  within their respective
  departments or divisions, shall be exempt from  the  operation  of  this
  subchapter.
    b.  No  person  shall  be  employed by a duly licensed locksmith as an
  apprentice or trainee unless such person shall have  a  trainee-license,
  the  annual  fee  for which shall be ten dollars, and during the time in
  which such person is so employed he or she shall  be  under  the  direct
  supervision  of  said licensed locksmith and such person may perform the
  duties of a locksmith. Such apprentice  or  training  period  shall  not
  exceed thirty-six months. Each such licensed locksmith employer shall be
  responsible  for notifying the department as to the termination or other
  change in the employment of any such apprentice or trainee.