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22.21
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Description
Classifications group
22 - ASSISTIVE PRODUCTS FOR COMMUNICATION AND INFORMATION MANAGEMENT
22.21 - Assistive products for face-to-face communication
22.21.03 - Letter and symbol sets and boards
22.21.06 - Communication amplifiers
22.21.09 - Dialogue units
22.21.12 - Face-to-face communication software
22.21.15 - Speech flow devices