Workers in this unit group prepare wool, cotton, flax, jute, hemp and other natural textile fibres for spinning and winding. Their functions include: grading and classifying natural textile fibres; washing wool fibres; tending machines which mix textile fibres into uniform blends; operating machines which clean and fluff textile fibres, transform them into sliver, comb them into sliver for first drawing, combine slivers into sliver lap or sliver laps into ribbon lap,combine several slivers into one attenuated strand of regular quality and weight, or transform sliver into roving; performing related fibre-preparing tasks.