been designed from wallpaper Durant once saw in a French hotel room. More recent research by historian Ken Kaufmann presents a case that the logo is based on a logo of the "Coalettes" coal company. An example of this logo as it appeared in an advertisement for Coalettes appeared in the Atlanta Constitution on November 12, 1911. Others claim that the design was a stylized Swiss cross, in tribute to Chevrolet's home country. Over time, Chevrolet would use several different iterations of the bowtie logo at the same time, often using blue for passenger cars, gold for trucks, and an outline (often in red) for cars that had performance packages. Chevrolet eventually unified all vehicle models with the gold bowtie in 2004, for both brand cohesion as well as to differentiate itself from Ford (with its blue oval logo) and Dodge (who has often used red for its imaging), its two primary domestic rivals. Louis Chevrolet had differences with Durant over design and in 1914 sold Durant his share in the company. By 1916, Chevrolet was profitable enough with successful sales of the cheaper Series 490 to allow Durant to repurchase a controlling interest in General Motors. After the deal was completed in 1918, Durant became president of General Motors, and Chevrolet was merged into GM as a separate division. In 1919, Chevrolet's factories were located at Flint, Michigan; branch assembly locations were sited in Tarrytown, N.Y., Norwood, Ohio, St. Louis, Missouri, Oakland, California, Ft. Worth, Texas, and Oshawa, Ontario General Motors of Canada Limited. McLaughlin's were given GM Corporation stock for the proprietorship of their Company article September 23, 1933 Financial Post page 9. In the 1918 model year, Chevrolet introduced the Series D, a V8-powered model in four-passenger roadster and five-passenger tourer models. Sales were poor and it was dropped in 1919. Beginning also in 1919, GMC commercial grade trucks were rebranded as Chevrolet, and using the same chassis of Chevrolet passenger cars and building light-duty trucks, sharing an almost identical appearance with GMC products. Until 1921, Chevrolet Corporate headquarters were located at 57th and Broadway in New York City until April when the office was relocated to the General Motors Building at Cadillac Place in Detroit. In January 1921 a General Motors management survey recommended that the Chevrolet Division be cancelled, but Alfred P. Sloan Jr. recommended that the division be saved and William S. Knudsen, a