Treatment of common metals; treatment of precious metals; processing of photographic and cinematographic films; photocomposing, photographic printing, photogravure; slaughtering of animals; leather working and fur conditioning; saddlery working; textile treating, wool treating; dressmaking, embroidery; woodworking and timber processing; framing of works of art; treatment of liquids, chemicals, gas and air for industrial use; grinding of glass and optical glass; custom assembling of materials for others; services of a dental technician; pottery firing; production of energy; rental of generators; paper treating; printing, bookbinding; treatment of plastics.