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Originally incorporated in 1956, Delta Electrical Specialty Company (DESCO) manufactured and sold a continuity/voltage tester called the Circuitracer. In 1979 the parent company of Desco Industries Inc. (DII) was established. DII now consists of brands including Desco, CMG, Desco Asia, EMIT, Menda, Protektive Pak, Smart Clock, Statguard Flooring, Charleswater, and Vermason. The same basic design used for the original Circuitracer is still manufactured today and is offered through the Menda brand.