Leta 1750 je bila v Leanu v Massachusettsu zgrajena tovarna čevljev, ki je dodatno razvila lokalno tehnologijo čevljarstva. Tam delavci obutve ne izdelujejo več samostojno, za vsak proizvodni člen čevljev pa skrbi usposobljena oseba. Proizvodna linija se začne oblikovati. Sprva so čevlje še vedno izdelovali po naročilu, a da bi delavci imeli zaposlene v izven-sezone, je lastnik čevljarne začel izdelovati čevlje brez zadržkov. Ti čevlji, imenovani čevlji za prodajo, so razstavljeni v izložkih lokalnih trgovin. V prvih dneh sta brata Harvey uporabljala kočije za nalaganje čevljev za prodajo in njihovo prodajo v bližnjih krajih.
In 1793, they opened their first retail shoe store in Boston, selling finished shoes every Wednesday and Saturday. Since the middle of the eighteenth century, inventors have been working on the improvement of sewing machines. It was not until 1790 that the first sewing machine dedicated to leather processing was transformed by an Englishman named Thomas Saint. It's pretty much just an awl that goes straight up to punch holes in the leather. The British Sir Mark Brownler, who was the chief engineer of the New York Harbor, invented a press that used metal needles to sew the upper to the sole. In order to do his duty in Britain's war against Napoleon, with the help of disabled soldiers, Brownle produced 400 pairs of shoes a day. After the war, the British shoe industry returned to manual operations.
