The following persons and activities are exempt from this chapter while engaged in the proper discharge of their professional duties:
- (1) manufacturers' representatives or sales persons in retail outlets who demonstrate products or techniques for promotional purposes;
- (2) educational activities conducted in connection with any monthly, annual, or other special program from which the general public is excluded. This exemption applies only to the specific days of the special program; and
- (3) a demonstration conducted by manufacturers and wholesalers for the purpose of exhibiting the technical application and use of products.