Standard Occupational Classification (SOC) 1991
- J - Occupations Unique to Processing, Manufacturing and Utilities
- J1 - Machine Operators in Manufacturing
- J12 - Machine Operators and Related Workers in Metal and Mineral Products Processing
- J121 - Machine Operators, Mineral and Metal Processing
- J122 - Foundry Workers
- J123 - Glass Forming and Finishing Machine Operators and Glass Cutters
- J124 - Concrete, Clay and Stone Forming Operators
- J125 - Inspectors and Testers, Mineral and Metal Processing
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