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    • 1950 – 1969

    This photograph is part of a series of marketing images used to demonstrate the small size of Helipot products.

    Potentiometers regulate the flow of electricity, like the volume dial on a radio. In 1940, Arnold O.…

    • 1960s

    This photograph is part of a series of marketing images used to demonstrate the small size of Helipot products. The text on the label identifies the product as a Model 77P Helitrim potentiometer and the photographer, "A…