A professional who tends equipment that mixes ingredients for use in producing margarine. Respnsibilities include:

• Turns valve to admit liquid ingredients, such as water or milk, into mixing vat.
• Dips measuring stick into vat and closes valve when liquid reaches specified level.
• Weighs specified quantities of dry ingredients, such as salt and powdered milk, and empties ingredients into vat.
• Starts agitator to mix liquid and powdered ingredients for specified time.
• Turns valve to empty mixed ingredients from vat for further processing.