Test or repair mobile or stationary radio transmitting and receiving equipment and two way radio communications systems used in ship to shore communications and found in service and emergency vehicles.

Repair, install or maintain mobile or stationary radio transmitting, broadcasting, and receiving equipment, and two way radio communications systems used in cellular telecommunications, mobile broadband, ship to shore, aircraft to ground communications, and radio equipment in service and emergency vehicles. They test and analyze network coverage.

Repair, maintain, or install computers, word processing systems, automated teller machines, and electronic office machines, such as duplicating and fax machines.

Directly supervise and coordinate the activities of mechanics, installers, and repairers.

Help extraction craft workers, such as earth drillers, blasters and explosives workers, derrick operators, and mining machine operators, by performing duties requiring less skill. Their duties include supplying equipment or cleaning work area.

Assemble or repair oil field equipment using hand and power tools. They perform other tasks as needed.

Operate machinery to install roof support bolts in underground mine.

Separate blocks of rough dimension stone from quarry mass using jackhammer and wedges.

Operate machinery such as longwall shears, plows, and cutting machines. They cut or channel along the face or seams of coal mines, stone quarries, or other mining surfaces. They facilitate blasting, separating, or removing minerals or materials from mines or from the surface. Includes shale planers.

Operate self propelled mining machines that rip coal, metal and nonmetal ores, rock, stone, or sand from the mine face and load it onto conveyors or into shuttle cars in a continuous operation.