US Department of Labor, Standard Industrial Classification Manual 1987… (1987 | noyear)
“ Many of the industries are engaged in various related activities. For example, establishments of communications, pipeline, and utility enterprises include a variety of activities, such as power generation, pumping, transmission, and distribution. Establishments primarily engaged in such activities are all classified in this division. Establishments primarily engaged in new or replacement construction for establishments of these types of enterprises are classified as operating establishments in Division C, Construction. ”
