Perform work involving the skills of two or more maintenance or craft occupations to keep machines, mechanical equipment, or the structure of an establishment in repair. Their duties iclude pipe fitting; boiler making; insulating; welding; machining; carpentry; repairing electrical or mechanical equipment; installing new equipment; and repairing buildings, floors, or stairs.

Repair, clean, and adjust mechanisms of timing instruments, such as watches and clocks. Includes watchmakers, watch technicians, and mechanical timepiece repairers.

Repair percussion, stringed, reed, or wind instruments. They specialize in one area, such as piano tuning.

Test, adjust, or repair biomedical or electromedical equipment.

Repair and adjust cameras and photographic equipment, including commercial video and motion picture camera equipment.

Install and repair telecommunications cable, including fiber optics.

Install or repair cables or wires used in electrical power or distribution systems. They erect poles and light or heavy duty transmission towers.

Build or repair equipment such as furnaces, kilns, cupolas, boilers, converters, ladles, soaking pits and ovens, using refractory materials.

Install, dismantle, or move machinery and heavy equipment according to layout plans, blueprints, or other drawings.

Lubricate machinery, change parts, or perform other routine machinery maintenance.