Standard Industrial Classification (SIC)
The Standard Industrial Classification (SIC) is a legacy United States government system for classifying industries by a four-digit code, established in 1937 and largely superseded by NAICS. SIC codes remain in use across many federal datasets. SAWGraph uses SIC codes, alongside NAICS, to classify the industry of facilities in its Facilities and Industries Ontology (FIO) knowledge graph, where facility records drawn from EPA's Facility Registry Service carry SIC classifications.
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