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| Primary NAICS Code | Primary Industry | Working Business Activity |
| 238120 | Structural Steel and Precast Concrete Contractors |
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| NAICS Code 2 | Industry 2 | Working Business Activity |
| 331210 | Iron and Steel Pipe and Tube Manufacturing from Purchased Steel |
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| NAICS Code 3 | Industry 3 | Working Business Activity |
| 332312 | Fabricated Structural Metal Manufacturing |
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| NAICS Code 4 | Industry 4 | Working Business Activity |
| 332996 | Fabricated Pipe and Pipe Fitting Manufacturing |
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| NAICS Code 5 | Industry 5 | Working Business Activity |
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