I 1750 blev der bygget en skofabrik i Lean, Massachusetts, som videreudviklede den lokale skofremstillingsteknologi. Der fremstiller arbejdere ikke længere sko selvstændigt, og hvert produktionsled af sko har ansvaret for en uddannet person. Produktionslinjen begynder at dannes. I starten blev skoene stadig lavet på bestilling, men for at holde arbejderne beskæftiget i lavsæsonen, begyndte ejeren af skobutikken at lave sko uden forbehold. Disse sko, kaldet sko til salg, vises i vinduerne i lokale butikker. I de tidlige dage brugte Harvey-brødrene vogne til at læsse sko til salg og sælge dem på nærliggende steder.
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.
