This category is based on just one of the nine original
1831 categories, "Employed in Manufacture, or in making Manufacturing
Machinery". As such, it excludes handicraft workers, who cannot be
separated from those in "Retail Trades", and those "capitalists"
and (non-agricultural) labourers who worked in manufacturing.
"C_OCC_PAR1831_SIMP_2" is contained within: