Take a century long trek through the American Auto factories.  Witness the evolution of the American auto factory beginning with the basic hand-built assembly of cars in the earliest part of the twentieth century, through the age of the assembly line, and up to todays robotically-operated lines. Concentrating on the 1920s to 1950s, large photographs of the assembly lines in action send readers into nostalgic old factories. See the workers, the tools, the methods and the machines that combined their efforts with the ingenuity of industry players.  Flash back in time to witness the factories decade by decade in never-before-published vintage photographs.