This collection consists of the records of the Duplex Power Car Company and the Duplex Truck Company. Included in these records are articles of association, correspondence, patent certificates, reports of audits from 1917 to 1955, as well as profit and loss statements for the same years. Also found in the collection are stock certificates from 1916 to 1955, stockholders records and minute books of meetings, records of agreements regarding labor conditions and land purchase, circuit court records, and other documents relating to the company.