apparatus for the transmission of sound; instruments for the transmission of sound; electrical apparatus for the transmission of audio signals; audio electronic apparatus; transmitters for use in the transmission of television programmes; sound adapters being parts of radio receiving apparatus; fixed radio apparatus for voice transmission; apparatus for sound transmission; transmitters for the transmission of electronic signals; travel guides in the form of audio recordings; radio receivers for connection to hearing aids; instruments for use in reception of electronic signals; electronic units for transmitting audio signals; radio signal transmission apparatus; apparatus for transmitting audio signals; audio transmitter units; radio transmission apparatus; audio frequency apparatus; voice frequency transmission apparatus; electronic signal transmission apparatus; audio amplifiers; signal transmission apparatus; audio apparatus; wireless transmission apparatus; electronic audio apparatus

hearing apparatus for the deaf; listening apparatus for use by persons with impaired hearing