In 1800, shoes in the United States were made by craftsmen, each trained to create an entire shoe. A century later, shoes were mass-produced in factories employing dozens of machines and specialized workers. Ross Tomson describes this transition from craft to mechanized production in one of the largest American industries of the nineteenth century.

Early shoe machinery originated through innovations made by shoemakers, tailors, and especially machinists. It contined to evolve through a process of ""learning by selling,"" in which sales of one generation of machines led to technological learning and ongoing invention by those who used, serviced, and sold them. As a result of this process, the mechanization of the shoe industry and the manufacturers of the machinery it used -- including such firms as Singer and United Shoe Machinery -- evolved together.

In researching the process of industrialization, Thomson examined nearly 8,000 patents. Comparing the patent information with directories for more than eighty American cities, he was able to find out who the inventors were, who employed them, how many patents they held, and the extend to which their inventions were used.

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