From the mid-19th century, some people put the chronograph on the belt, and started wearing it on the wrist, gradually improving, reducing the body shape, beautifying the style, and developing into a watch.The world's first watch was made by Patek Philippe in 1868 to Countess Koscowicz of Hungary. But this form of timepiece was not popular at the time. In 1904, the French businessman Louis Vrançois Cartier, who ran jewelry, received a complaint from the pilot friend Alberto Santos Dumont: It is very difficult to take the pocket watch out of the pocket when driving the plane. I hope he can assist. Solve this problem so that you can see the time while you are flying.