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Model 20 of a direct current (DC) voltmeter created by the F. L. Moseley Company (409 North Fair Oaks Avenue). The F. L. Moseley Company was founded by Francis Loring Moseley in 1951 as an electronic equipment manufacturer. The company was acquired by Hewlett Packard Company in the fall of 1958, and was the first company to merge with HP. The image was taken on April 2, 1955.