Hearing aids; Acoustic amplifiers (hearing aids) for partially deaf persons; Programmable hearing aids; Medical instruments for use as aids to hearing; Medical instruments for use in relation to hearing; Medical hearing instruments; Listening apparatus for use by persons with impaired hearing; Hearing devices for use by persons with a hearing impairment; Hearing apparatus for the deaf; Electronic hearing apparatus with masking for tinnitus sufferers; Ear adaptors for hearing aids; Apparatus for use in treating hearing disorders; Apparatus for use in alleviating hearing disorders