3. The activities carried on at each establishment specified in column 1 of the Schedule to this Order, being an establishment of an employer in the industry of an industrial training board, shall, instead of being included for the purposes of the Act in the industry of the industrial training board established by the industrial training order specified in column 2 of that Schedule, be included for those purposes in the industry of the industrial training board established by the industrial training order specified in column 3 of that Schedule.