Introduction
Chapter 1: Switching systems and equipment
Section 1 Switching systems
Section 2 Block symbols for switching equipment
Section 3 Elements of selectors
Section 4 Selectors
Chapter II: Telephone, telegraph amd data equipment
Section 5 Telephone sets
Section 6 Telegraph and data apparatus
Section 7 Telegrapn repeaters
Chapter III: Transducers, recorders and reproducers
Section 8 Qualifying symbols specific to this chapter
Section 9 Transducers
Section 10 Recorders and reproducers
Annex A (informative) Older symbols
Annex B (informative) English alphabetic index