History of Computers: It was not long before scientists realized that Pascal's toothed wheels could also perform multiplication by repeated addition of a number. The German philosopher and mathematician, Baron von Leibnitz (1646-1716), added this improvement to the Pascal machine in 1671, but did not complete his first calculating machine until 1694. The Leibnitz  reckoning machine was the first two-motion calculator designed to multiply by repeated addition, but mechanical flaws prevented it from becoming popular.

Charles Xavier Thomas de Colmar (1785-1870), of France, makes his Arithmometer, the first mass-produced calculator. It does multiplication using the same general approach as Leibniz's calculator; with assistance from the user it can also do division. It is also the most reliable calculator yet. Machines of this general design, large enough to occupy most of a desktop, continue to be sold for about 90 years.

Source:
"Electronic Computers Made Simple" by Henry Jakobowitz