Communication and information management aids
Y21 33,310 devices
Subcategories
- Y2103 Optical aids
- Y2106 Optical electronic aids
- Y2109 Personal computer input and output peripheral equipment
- Y2115 Writing machines and text processing systems
- Y2127 Non-optical reading aids
- Y2136 Telephones and telephoning aids
- Y2139 Sound transmission systems
- Y2142 Interpersonal comunication devices
- Y2145 Hearing aids
- Y2151 Alarm systems + signalling, indication and reminder aids
- Y2199 Communication and information management aids - other