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Keith arc lamp regulator, patent #255,795

Keith, Nathaniel S. · ca 1883 · overall: 30 in x 14 1/2 in x 6 in; 76.2 cm x 36.83 cm x 15.24 cm

From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.

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Credit lineKeith arc lamp regulator, patent #255,795. ca 1883. Keith, Nathaniel S.. National Museum of American History. CC0.

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