Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Product group plan
4.1 General
4.2 Code letters for main product groups and subproduct groups
4.2.1 Code letters for the main product groups (MPG)
4.2.2 Code letters for the subproduct groups (SPG)
4.3 Combined groups
Annex A (informative) Examples of product groups
Bibliography