Close-up view of an electric immersion heater used during the early stages of synthetic fiber production and research at DuPont. The photographs is captioned "Figure 3," indicating that it appeared in a report or publication.
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“Electric Immersion Heater,” November 11, 1946. Joseph X. Labovsky Collection of Nylon Photographs and Ephemera, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/bc386j29t.
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