For maintenance under the box head position, you should add an electrical engineer position. (The K. k-Toemsak Mr. Golf) because he was a general staff position.
For maintenance work under the supervisor position, you should add the Electrician (K. Mr. Toemsakdi K - golf), because he was promoted from the General Staff.
For maintenance supervisor position under the box you should add the electrician (K. You fill the enemies กดิ์ K - golf) because he was promoted. From the general staff.