<Li> In 1842, Timoleon Maurel invented the Arithmaurel, based on the Arithmometer, which could multiply two numbers by simply entering their values into the machine . </Li> <Li> In 1845, Izrael Abraham Staffel first exhibited a machine that was able to add, subtract, divide, multiply and obtain a square root . </Li> <Li> Around 1854, Andre - Michel Guerry invented the Ordonnateur Statistique, a cylindrical device designed to aid in summarizing the relations among data on moral variables (crime, suicide, etc .) </Li> <Li> In 1872, Frank S. Baldwin in the U.S. invented a pinwheel calculator . </Li>

Who was the inventor of mechanical calculator for adding numbers