Assistive listening device for the hearing impaired; Digital hearing aids; Ear plugs for medical purposes; Ear plugs for noise reduction; Ear plugs for sleeping; Ear trumpets; 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...