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  • Measured for Success: HP 400A Ad

Measured for Success: HP 400A Ad

Ad for the HP 400A voltmeter from 1946. Enlarge
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Date: 1946

Hewlett-Packard voltmeters would become one of the longstanding, reliable products offered by the company in the postwar period. The 400A model was engineered for “dependability and uniformity of accuracy.”

Tags: 1940s • 1946 • Ad • Voltmeter

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