follow criteria on working hours, working environment and wages. Products must meet criteria for energy efficiency, ergonomic design and limited hazardous substance content. See also Swedish Federation of Salaried Employees in Industry and Services (PTK) Swedish Public Employees' Negotiation Council (OFR) Swedish Confederation of Professional Associations (SACO) Swedish Trade Union Confederation (LO'') Footnotes External links TCO product labeling. TCO's Eva Nordmark:Unions must be relevant to our time Labour movement in Sweden International Trade Union Confederation European Trade Union Confederation Council of Nordic Trade Unions 1931 establishments in Sweden Trade unions established in 1931