ETSI - European Telecommunications Standards Institute
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PRETS 300 381-1994
PRETS 300 381-1994 history
1994PRETS 300 381-1994 Telephony for Hearing Impaired People; Inductive Coupling of Telephone Earphones to Hearing Aids
1993PRETS 300 381-1993 Telephony for Hearing Impaired People; Inductive Coupling of Telephone Earphones to Hearing Aids Performance Requirements and Testing Methods