INCITS/ISO 5138-4 : 1981

1 Scope and field of application
2 Principles and rules followed
  2.1 Definition of an entry
  2.2 Organization of an entry
  2.3 Classification of entries
  2.4 Selection of terms and wording of definitions
  2.5 Multiple meanings
  2.6 Abbreviations
  2.7 Use of parentheses
  2.8 Other languages
  2.9 Use of terms printed in italic typeface in definitions
       and use of asterisks
  2.10 Organization of the alphabetical index
3 Terms and definitions
  04 Letter opening machines
     04.01 Definition
     04.02 Classification
4 Alphabetical index
  English
  French

Deals with letter opening machines. It concerns the main operating processes and types of machines used, their functions and technical Parts.