A professional who performs any combination of following tasks involved in sealing coke-oven doors with lute (mud made from clay, coke dust or ashes, and water) to prevent escape of gases during baking of coal. Respnsibilities include:

• Shovels mud into mud carrier and transfers mud pails to ovens.
• Chips old clay, carbon, and residue from doorway of oven, using chisel bar.
• Seals crack around oven door with mud, using trowel and tamping bar.
• Shovels dry clay into dry-clay box on pusher or into wheelbarrow.
• Shovels excess mud, oven spillage, and coal from working area.
• Opens and closes chuckhole door, using handwheel and lever.
• May open oven, using bar, and manually position coke guide in doorway.
• May signal larry operator to charge oven.
• May push buttons to move electric mud car.