What french mathematician built and sold the first gear-driven mechanical machine that did addition and subtraction?

i can try to solve it just show the graph.

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.

muhammad (pbuh) was the messenger of allah (swt) his mission was to praise the name of his lord and the words of his lord thats where the qur'an comes in

i believe it was ccc - civilian conservation corps