Workers in this unit group perform tasks not classified elsewhere in the preparation and processing of food products for human and animal consumption. Their functions include; extracting oil from oil-bearing seeds, nuts and fruits; operating machines to refine crude soya bean, cotton seed, peanut and other edible oils; operating equipment to process oils and fats used in making margarine and equipment to make margarine; preparing fish and other sea or freshwater foods for sale or curing; performing related tasks.