A professional who tends machine that forces mortar into spaces between firebrick and steel shell of taconite ore furnace. Respnsibilities include:

• Inspects furnace to detect discoloration spots which indicate flaws in firebrick inner wall of furnace.
• Shovels grout into reservoir of machine.
• Attaches airhose to compressed air system and grout hose to nipple on shell of furnace with wrench.
• Starts machine and observes pressure gauge to determine when space is filled.
• Caps nipple welded onto furnace shell, using wrench.
• May mix mortar, using electrically driven paddle wheel.
• May dismantle and clean grout machine and equipment, using wrenches, water, and airhoses.