Listening devices to improve the quality of sound, namely, assistive listening devices not for medical purposes, for sound enhancement, noise cancellation and feedback suppression; computer software and hardware to control and improve hearing equipment sound quality

Listening devices to improve the quality of sound, namely, assistive listening devices not for medical purposes, for sound enhancement, noise cancellation and feedback suppression; computer software and hardware to control and improve hearing equipment sound quality

Listening devices to improve the quality of sound, namely, assistive listening devices for sound enhancement, noise cancellation and feedback suppression; computer software and hardware to control and improve hearing equipment sound quality