Heels went out of fashion starting around 1810, and then in 1860 they returned at about two and a half inches. The Pinet heel and the Cromwell heel were both introduced during this time. Their production was also increased with the invention and eventual mass production of the sewing machine around the 1850s. With sewing machines, yields increased as machines could quickly and cheaply "position[n] the heel, stitc[h] the upper, and attac[h] the upper to the sole." This is also a prime example of how the popularity of heels interacts with the culture and technology of the time.
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