NF C03-162-1*NF EN 81346-1:2009 Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 1 : basic rules.
1996NF C03-161:1996 INDUSTRIAL SYSTEMS, INSTALLATIONS AND EQUIPMENT AND INDUSTRIAL PRODUCTS. STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS. PART 1 : BASIC RULES. (EUROPEAN STANDARD EN 61 346-1).