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| Picture No | 10100763 |
| Date | 1886 |
| Description | Blodgett's Hearing Aid |
| Details |
Diagrams to show Blodgett's micro-audiphone hearing aid and how it is inserted into the ear
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| Source | Illustration in the Scientific American, Vol I, 30th January 1886, page 66 |
| Credit | Mary Evans Picture Library |
| Restrictions |
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