Production worker

"Employee directly connected with industrial manufacturing or operational processes, as contrasted with supervisory, office or clerical employees; for example, assembly line workers in the radio and television industries."
(Termium, Production worker, visited 2011-03-157)

"In empirical international studies of skilled and unskilled labour, data on production workers are often taken to represent unskilled labour."
(United Nations (UN), UNTERM, visited 2009-06-11)