If an employee is not formally declared by the employer to have satisfactorily completed the period of probation on completion of the time-stretch prescribed or extended it, the employee would be deemed as a probationer only unless there is any deeming provision in the service regulations to the contrary. It is important that the declaration of probation by the employer must be in writing. If the practice continues for an indefinitely long period, it would be an unfair labor practice on the part of the employer.