Credential admissions may, also, be issued to any of the following persons:

1. (a) Representatives of press, radio, and television personally engaged in obtaining and transmitting public information.
2. (b) Ambulance drivers.
3. (c) Firemen on duty.
4. (d) Repairmen who are necessary to service utilities.
5. (e) Employees of the fair.
6. (f) State officials in the performance of their duty.