Voltage regulators maintain a constant voltage level in electrical devices. These regulators are pictured on top of the dictionary entry for "voltage regulator," as part of a series of images designed to highlight the small size of Helipot electrical components.
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Armstrong & Hess. “Helipot Model 805 Voltage Regulators on a Dictionary Page,” 1950–1969. Beckman Historical Collection, Box 85. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/3x816n02f.
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