| 2792457 | Hearing aid embodied in spectacles | |||
| 2566313 | Sound conducting tube for hearing aids | |||
| 2513746 | Hearing aid support | |||
| 2503275 | Adjustable eyeglass temple | |||
| 2437490 | Ear defender | |||
| 2215585 | Sound listening device | |||
| 2207705 | Hearing aid device | |||
| 1975490 | Eyeglasses | |||
| 1096024 | N/A | |||
| 0404868 | N/A |
| DE344526C | ||||
| FR537556A | ||||
| GB541226A | ||||
| IT494016B |