Blodgett's Hearing Aid
Diagrams to show Blodgett's micro-audiphone hearing aid and how it is inserted into the ear
Picture No
10100763
Media ID
47305957
Size
4032px x 4340px
(3.0MB)
Credit
Mary Evans Picture Library
Source
Illustration in the Scientific American, Vol I, 30th January 1886, page 66
Date
1886
