The North American Industry Classification System NAICS is a system for classifying industries by a six-digit code. [Wikipedia]
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TOP Description Asmts Reccs
331xxx Primary Metal Manufacturing 431 3,794
open 3311xx Iron and Steel Mills and Ferroalloy Manufacturing 24 158
open 3312xx Steel Product Manufacturing from Purchased Steel 88 857
open 3313xx Alumina and Aluminum Production and Processing 74 635
open 3314xx Nonferrous Metal (except Aluminum) Production and Processing 51 458
open 3315xx Foundries 194 1,686
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