Archived - Standard Industrial Classification - Establishments (SIC-E) 1980
- F - Construction Industries
- 42 - Trade Contracting Industries
- 425 - Mechanical Specialty Work
- 4251 - Process Piping Work
- 4252 - Automatic Sprinkler System Installation
- 4253 - Commercial Refrigeration Work
- 4254 - Environmental Control Work
- 4255 - Millwright and Rigging Work
- 4256 - Thermal Insulation Work
- 4259 - Other Mechanical Specialty Work
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