This photograph is part of a series of marketing images used to demonstrate the small size of Helipot products, in this case voltage regulators. The penny, minted in 1968, establishes the earliest possible date for the photograph.
|View in library catalog|
Armstrong & Hess. “Beckman Model 859 Voltage Regulator with Change Purse and Coins,” 1950–1969. Beckman Historical Collection, Box 85. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/t722h9139.
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