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Standard Industrial Classification - Companies and Enterprises (SIC-C) 1980
Structure
| L | I | Construction and Related Activities |
| L | 40 | Real Estate Developers, Builders and Operators |
| L | 401 | Real Estate Developers and Builders |
| L | 4011 | Residential Developers and Builders |
| L | 4012 | Non-Residential Developers and Builders |
| L | 402 | Real Estate Operators |
| L | 4021 | Operators of Residential Buildings |
| L | 4022 | Operators of Non-Residential Buildings |
| L | 4029 | Other Real Estate Operators |
| L | 403 | Real Estate Developers, Builders and Operators, Integrated Operations |
| L | 4031 | Real Estate Developers, Builders and Operators, Integrated Operations |
| L | 404 | Prefabricated and Pre-Engineered Buildings Manufacturing |
| L | 4041 | Prefabricated and Pre-Engineered Buildings Manufacturing |
| L | 41 | Industrial, Highway and Heavy Engineering General Contracting |
| L | 411 | Highway, Street and Bridge General Contracting |
| L | 4111 | Highway, Street and Bridge General Contracting |
| L | 412 | Industrial and Heavy Engineering General Contracting |
| L | 4121 | Electric Power Plant General Contracting |
| L | 4122 | Waterworks and Sewage System General Contracting |
| L | 4129 | Other Industrial and Heavy Engineering General Contracting |
| L | 42 | Special Trade Contracting |
| L | 421 | Structural and Related Work |
| L | 4211 | Structural and Related Work |
| L | 422 | Building Exterior and Interior Work |
| L | 4221 | Building Exterior and Interior Work |
| L | 423 | Electrical and Mechanical Work |
| L | 4231 | Electrical Work |
| L | 4232 | Mechanical Work |
| L | 4233 | Electrical and Mechanical Work, Combined Operations |
| L | 429 | Other Special Trade Contracting |
| L | 4291 | Site Work |
| L | 4299 | Other Special Trade Contracting n.e.c. |
| L | 43 | Services Incidental to Construction and Building Operations |
| L | 431 | Services Incidental to Construction |
| L | 4311 | Architectural Services |
| L | 4319 | Other Services Incidental to Construction |
| L | 432 | Services Incidental to Building Operations |
| L | 4321 | Building Management Services |
| L | 4322 | Real Estate Agents and Brokers |
| L | 4329 | Other Services Incidental to Building Operations |
| L | 44 | Building Materials |
| L | 441 | Cement, Concrete and Concrete Products Manufacturing |
| L | 4411 | Cement Manufacturing |
| L | 4412 | Ready-Mix Concrete Manufacturing |
| L | 4413 | Concrete Products Manufacturing |
| L | 4414 | Concrete and Concrete Products, Integrated Operations |
| L | 442 | Asbestos Mining and Manufacturing |
| L | 4421 | Asbestos Mining and Manufacturing |
| L | 448 | Other Building Materials Mining and Manufacturing |
| L | 4481 | Quarries and Sand Pits |
| L | 4489 | Other Building Materials Mining and Manufacturing n.e.c. |
| L | 449 | Building Materials Wholesaling |
| L | 4491 | Building Materials Wholesaling |
