Insert earphones and replacement parts therefor for use with sound-emitting devices; earphones and replacement parts therefor; integrated circuits, especially those used in audio and hearing aid applications; insert earphones
Electrical and Scientific ApparatusMedical equipment for testing hearing and hearing protecting devices, namely, earplugs for medical use; hearing aid devices, and parts therefor; hearing protection devices, namely, earplugs not for medical purposes and replacement parts therefor
Medical Apparatus