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Walter D. Reed
Portable Amplified Hearing Aid 1942
Portable Amplifier Aids the Deaf
Because of its surprising power this ampliÂfier can also be used for other purposes such as detective work. Extension of "mike" cable is only change needed.
by Walter E. Burton
Hearing Aid Amplified 1942
Hearing Aid Layout and parts October 1942 Mechanix Illustrated
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Hearing Aid Wiring Diagram
Portable Amplifier Hearing Aid 1942 wiring diagram
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Portable Amplifier Hearing Aid 1942
This complete hearing aid consists of an amplifier unit with microphone and volume control, a battery unit, and single earphone with headband.
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Hearing Aid 1942
Using 3 miniature amplifier tubes and powered by standard radio and flashlight batteries.
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