Assistive listening device for the hearing impaired; Digital hearing aids; Electric hearing aids; Electrical hearing aids; Electrically-operated hearing aids; Hearing aids; Hearing aids for the deaf; Hearing protectors without the ability to reproduce or transmit sound; Medical hearing instruments and parts of such devices; Medical testing devices for measuring hearing loss in patients, namely, audiometers; Parts of acoustic apparatus for the hearing-impaired, namely, cerumen protection syste...