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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. | | Eveready 505E Hearing Aid "B" Battery This is an Eveready 22˝ volt Mini-Max hearing aid "B" battery used in 1-piece vacuum tube hearing aids in the 1940s and 1950s. It weighed about 1 oz., and measured 2" by 5/8" by 5/8". |  | Click picture for larger view | | | | | | | | A newer version of the Eveready 505E battery.
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