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One way to identify an industry is to look at a list of NAICS codes. Reviewing the code categories can also help you think about how narrowly you may want to scale your industry search. For example, do you want to research the whole construction industry or just cranes?
"The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy." Use this website to search for a specific industry by keyword.