Works at opposite end of coal strata assisting LONG-WALL-MINING-MACHINE TENDER (mine & quarry) to advance plow blade through face of coal in underground or surface mine: Pulls levers to adjust depth of penetration of blade.
Signals LONG-WALL-MINING-MACHINE TENDER (mine & quarry) by electronic buzzer or two-way radio when machine plow blade is properly positioned. Adjusts and makes minor repairs to equipment, using handtools. May assist in positioning jacks, timbers, or roof supports to prevent cave-ins when working underground.
