Opinion 2/91, delivered on 19th March 1993, in relation to Convention No. 170 of the International Labour Organisation concerning safety in the use of chemicals at work - International Journal of Comparative Labour Law and Industrial Relations View Opinion 2/91, delivered on 19th March 1993, in relation to Convention No. 170 of the International Labour Organisation concerning safety in the use of chemicals at work by - International Journal of Comparative Labour Law and Industrial Relations Opinion 2/91, delivered on 19th March 1993, in relation to Convention No. 170 of the International Labour Organisation concerning safety in the use of chemicals at work 9 3 International Journal of Comparative Labour Law and Industrial Relations