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| Primary NAICS Code | Primary Industry | Working Business Activity |
| 238140 | Masonry Contractors |
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| NAICS Code 2 | Industry 2 | Working Business Activity |
| 238990 | All Other Specialty Trade Contractors |
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| NAICS Code 3 | Industry 3 | Working Business Activity |
| 423320 | Brick, Stone, and Related Construction Material Merchant Wholesalers |
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| NAICS Code 4 | Industry 4 | Working Business Activity |
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| NAICS Code 5 | Industry 5 | Working Business Activity |
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