Assistive listening device for the hearing impaired; Cases fitted for medical instruments; Ear plugs for medical purposes; Ear plugs for noise reduction; Ear plugs for soundproofing; Ear plugs for soundproofing, other than for medical use; 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; Wireless transmitters and receivers for use with hearing aids