Ensure the safe takeoff and landing of commercial and military aircraft. Their duties include coordination between air traffic control and maintenance personnel; dispatching; using airfield landing and navigational aids; implementing airfield safety procedures; monitoring and maintaining flight records; and applying knowledge of weather information.

Perform a variety of duties such as mixing materials, assembling mold parts, filling molds, and stacking molds to mold and cast a wide range of products.

Cut or carve stone according to diagrams and patterns.

Engrave or carve metal, wood, rubber, or other materials. Includes such workers as etcher circuit processors, pantograph engravers, and silk screen etchers.

Perform work involved in developing and processing photographic images from film or digital media. They perform precision tasks such as editing photographic negatives and prints.

Manufacture electronic semiconductors. They load materials into furnace. They cut ingots and load them into crystal growing chamber and monitor controls. They locate crystal axis in ingot using x ray equipment and cut ingots into wafers. They clean, polish, and load the wafers into furnaces, chemical baths and equipments to form circuitry and change conductive properties.

Construct and repair full or partial dentures or dental appliances.

Monitor, operate, and maintain landfill gas collection system components and environmental monitoring and control systems.

Calculate, measure, load, mix, and process refined feedstock with additives in fermentation or reaction process vessels and monitor production process. They perform, and keep records of, plant maintenance, repairs, and safety inspections.

Coordinate, regulate, or distribute electricity or steam.