ETSI ES 200 381-1-2012 Telephony for hearing impaired people; Inductive coupling of telephone earphones to hearing aids; Part 1: Fixed-line speech terminals (V1.2.1)
European Telecommunications Standards Institute (ETSI)
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ETSI ES 200 381-1-2012
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2012ETSI ES 200 381-1-2012 Telephony for hearing impaired people; Inductive coupling of telephone earphones to hearing aids; Part 1: Fixed-line speech terminals (V1.2.1)