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| On-line Hearing Aid Museum | Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more! | | | |
| Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid. | | Teutonophone No. 1 Hearing Aid Battery The Teutonophone No. 1, 3 volt battery was used in Teutonophone hearing aids around 1930. It only weighed 3½ oz., and measured 1⅝" by ¾" by 2⅝" high. |  | Click picture for larger view | | | | | | | | The top view of the Teutonophone No. 1 battery showing the flat spring contacts.
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