Workers in this unit group make pottery, porcelain ware, bricks, tiles and abrasive wheels. Their functions include: making articles of pottery and porcelain completely; making clay or plaster-of -Paris models of pottery and porcelain ware for use in preparing moulds; making plaster-of Paris moulds; forming ware on potter's wheels with hands, or using interior or exterior moulding shapes and shaping tools; forming ware by casting semi-liquid clay in plaster-of -Paris moulds; forming bricks and tiles of special shapes by hand; making ware by pressing plastic clay into moulds by hand; operating screw-press or hydraulic press to make products from clay dust; operating a machine which extrudes moist clay for further processing; forming abrasive wheels by moulding or pressing abrasive mixture; performing related tasks.