Ingelen 420K "Pen" Transistor Hearing Aid
The Ingelen 420K "Pen" hearing aid was manufactured in Vienna,
Austria by Radiofabrik Ingelen. They seem to only have produced about
three different models of hearing aids. They began manufacturing hearing aids in 1955, and
ceased in 1957.
The 420K had the unusual distinction of being a transistorized
hearing aid in the shape of a large black plastic and gold metal pen. It
was about 5½" in length and ¾" in diameter.
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The on-off volume control was on the top (black knob), and the
microphone was located just above the pocket clip.
You wore this hearing aid in your shirt pocket, where it could be
"hidden" with the other pens and pencils you might be carrying.
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The gold bottom of the Ingelen "Pen" unscrewed to access the
battery. It used either a mercury or alkaline "N" cell. |
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The Ingelen 420K "Pen" hearing aid in its original carrying case. |
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The Ingelen carrying case shown closed.
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