Workers in this unit group operate equipment to process sugar-cane and beet and make refined sugar. Their functions include: operating sugar-cane crushing equipment; operating batteries of diffusers to extract sugar liquor from beet; controlling tanks in which sugar liquor is purified by carbonation process; tending tanks in which sugar crystals are produced from hot sugar liquor; operating and controlling series of machines which refine beet or cane sugar by a continuous process; performing related tasks such as extracting and refining sugar juices from maple, palm and other vegetable sources.