This major category includes occupations concerned with using body members, hand tools, and bench machines to fabricate, inspect, or repair relatively small equipment. The work is usually performed at a set position or station in a shop, or at a bench, or worktable.

This subcategory includes occupations concerned with assembling, fabricating, and repairing scientific and medical apparatus, and photographic and optical goods.

This subcategory includes occupations concerned with assembling, fabricating, or repairing equipment, components, and parts for equipment to transmit, control, or convert electrical power; signaling and detection equipment; radio and television equipment; and communications equipment.