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| Primary NAICS Code | Primary Industry | Working Business Activity |
| 236210 | Industrial Building Construction |
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| NAICS Code 2 | Industry 2 | Working Business Activity |
| 236220 | Commercial and Institutional Building Construction |
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| NAICS Code 3 | Industry 3 | Working Business Activity |
| 238210 | Electrical Contractors and Other Wiring Installation Contractors |
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| NAICS Code 4 | Industry 4 | Working Business Activity |
| 238220 | Plumbing, Heating, and Air-Conditioning Contractors |
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| NAICS Code 5 | Industry 5 | Working Business Activity |
| 238210 | Electrical Contractors and Other Wiring Installation Contractors |
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| Additional NAICS Codes |
| 238320; 238340; 238350; 238990 |
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