TDD
- b2 SENSORY FUNCTIONS AND PAIN
- s2 THE EYE, EAR AND RELATED STRUCTURES
- d3 COMMUNICATION
- e1 PRODUCTS AND TECHNOLOGY
- b230 Hearing functions
- d360 Using communication devices and techniques
- e125 Products and technology for communication
- b2309 Hearing functions, unspecified
- d3600 Using telecommunication devices
- e1251 Assistive products and technology for communication