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
back 331xxx Primary Metal Manufacturing 441 3,862
3312xx Steel Product Manufacturing from Purchased Steel 91 878
open 33121x Iron and Steel Pipe and Tube Manufacturing from Purchased Steel 32 276
open 33122x Rolling and Drawing of Purchased Steel 59 602
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