All of the following requirements must be met in order that an employee may be exempt under section 13(b) (9) :
(a)
The employee must be “employed as” an announcer, or a news editor, or a chief engineer.
(b)
The employee must be employed “by” a radio or television station.
(c)
The major studio of such radio or television station must be located in a city or town which meets the prescribed population and locality tests.