Workers in these occupations typically perform specialized work in an industrial plant or fixed-site facility. The apprenticeship opportunities in industrial trades are more limited than those available in the construction trades. Apprenticeships include: Air Frame & Power Plant Mechanics, Boiler Operators & Repairers, Bricklayers, Limited Maintenance Electricians, Manufacturing Plant Electricians, Equipment Operators, Gear Cutters, Heavy Duty Equipment Mechanics & Bus Mechanics, Instrument Mechanics & Instrument Repairers, Limited Energy Class B Technicians, Line workers/Installers/Repairers & Related Utility Occupations, Machinists, Maintenance Mechanics, Millwrights, Municipal Maintenance Workers, Pipefitters, Programmable Controller Technicians, Stationary Engineers, Tool & Die Makers, Tool Cutter Grinders, and Turbine Operators.