Surgical apparatus and instruments; medical apparatus and instruments for use in surgery; apparatus for the treatment of deafness in the nature of medical testing devices for measuring hearing loss in patients, namely, audiometers; apparatus for use in medical analysis in the field of otorhinolaryngology in the nature of in-ear monitors for medical purposes; testing apparatus for medical purposes in the field of otorhinolaryngology in the nature of medical testing devices for measuring hearing loss in patients, namely, audiometers; diagnostic apparatus for medical purposes in the field of otorhinolaryngology in the nature of electromagnetic medical diagnostic imaging apparatus; otorhinolaryngological instruments in the nature of medical instruments for measuring hearing loss in patients, namely, audiometers; hearing aids for the deaf; hearing protectors without the ability to reproduce or transmit sound