The officials shall be a referee and an umpire, who shall be assisted by the table officials, i. e. a scorer, an assistant scorer, a timekeeper and a 30-second operator The 30-second device shall be operated by the 30-second operator as follows.(...)
The 30-second operator shall restart the device from the time it was stopped as soon as a player of the same team gains control of the ball on the court after the throw-in from out-of-bounds.