Operate power pumps and auxiliary equipment to produce flow of oil or gas from wells in oil field.

Operate underground loading machine to load coal, ore, or rock into shuttle or mine car or onto conveyors. They use loading equipment which may include power shovels, hoisting engines equipped with cable drawn scraper or scoop, or machines equipped with gathering arms and conveyor.

Control and monitor biomass plant activities and perform maintenance as needed.

Perform precision assembling, adjusting, or calibrating, within narrow tolerances, of timing devices such as digital clocks or timing devices with electrical or electronic components.

Install, inspect, test, maintain, or repair electric gate crossings, signals, signal equipment, track switches, section lines, or intercommunications systems within a railroad system.

Repair and open locks, make keys, change locks and vault combinations and install and repair safes.

Install, service, adjust, or repair coin, vending, or amusement machines including video games, juke boxes, pinball machines, or slot machines.

Inspect, diagnose, adjust, or repair wind turbines. They perform maintenance on wind turbine equipment including resolving electrical, mechanical, and hydraulic malfunctions.

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.