19th Century hearing aid. Illustration of a 19th Century design for an early hearing aid. Published in 'Physique populaire' by Emile Desbeaux (1891). | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Collection Abecasis |
Bildgröße: | 3189 px × 2991 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |