Operate steam, gas, electric motor, or internal combustion engine driven compressors. They transmit, compress, or recover gases, such as butane, nitrogen, hydrogen, and natural gas.

Feed materials into or remove materials from machines or equipment that is automatic or watched over by other workers.

Manually move shipment, stock, or other materials or perform other general labor. Includes all manual laborers not elsewhere classified.

Wash or clean vehicles, machinery, and other equipment. They use materials such as water, cleaning agents, brushes, cloths, and hoses.

Operate industrial trucks or tractors equipped to move materials around a warehouse, storage yard, factory, construction site, or similar location.

Operate or watch over hoists or winches to lift and pull loads using power operated cable equipment.

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.

Operate or watch over machinery equipped with scoops, shovels, or buckets, to excavate and load loose materials.

Operate dredge to remove sand, gravel, or other materials in order to excavate and maintain navigable channels in waterways.

Operate mechanical boom and cable or tower and cable equipment to lift and move materials, machines, or products in many directions.