Scope and Contents 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...

Scope and Contents The papers of Henry T. Ewald, co-founder (1911, with Frank Campbell) of Campbell-Ewald Company, Inc. a Detroit, Michigan Advertising Agency. Upon Campbell's retirement in 1917, Ewald became President and Chairman of the Board, serving as such until his death in 1953. Under Ewald's leadership, the agency expanded, setting up branches in New York, Los Angeles, Chicago, Dallas and other cities, and had as clients such companies as General Motors, Burroughs Corporations, Detroit...