Code 9149 applies to employers engaged in operating a drive-in theater.  Most drive-in theaters operate on a seasonal basis usually from summer to the fall.  This classification includes all employees in connection with the drive-in theaters, such as but not limited to, cashiers, ushers, security guards, concession employees, and projectionists.  This classification also contemplates maintenance employees who repair the speakers, film projector or film screen.  Some drive-in theaters also operate a playground for children.