Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The 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!

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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

 

Body Type Transistor Hearing Aids

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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