Section 446. Application of article

1. This article shall not apply to or
  affect the practice of their professions by  duly  licensed  physicians,
  osteopaths,  dentists,  optometrists,  nurses or physiotherapists, or to
  the practice of their vocations by hairdressers or  cosmetologists,  nor
  to  any hospital which operates a barber shop solely for the convenience
  of its patients and which is not open to the public.
    2. This article shall not be construed to apply to, affect or  prevent
  the  practice  of beauty culture as now conducted in the beauty shops of
  the state, or the operation of beauty shops and barber schools.
    3. The provisions of this section shall not be construed to furnish  a
  means of evading the provisions of this article relating to the practice
  of  barbering  and  in  any  prosecution  for  a  violation  of any such
  provision, the terms "hairdresser, " "cosmetologist,  "  "beauty  shop,"
  and "practice of hairdressing and cosmetology" shall have their commonly
  accepted meanings.