SIC Codes divide all major economic activity into ten major divisions. The first two digits describe the nature of this activity in very general terms (i.e. Mining, Construction, Manufacturing). Remaining digits break down these categories into specific products and "sub-industries."
If more than one SIC Code is assigned to a company, the first one listed is the primary line of business. The remaining codes, if any, comprise at least 10 percent of the firm's annual revenue.
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