In 1966, Hiroshi Yamauchi, president of Nintendo at the time, came to a hanafuda factory where Yokoi was working at and took notice of a toy, an extending arm, that Yokoi made for his own amusement during spare time as the company's machine maintenance man. Yamauchi ordered Yokoi to develop it as a proper product for the Christmas rush. The Ultra Hand was a huge success, and Yokoi was asked to work on other Nintendo toys including the Ten Billion Barrel puzzle, a miniature remote-controlled vacuum cleaner called the Chiritory, a baseball throwing machine called the Ultra Machine, and a "Love Tester." He worked on toys until the company decided to make video games in 1974, when he became one of its first game designers, only preceded by Genyo Takeda. While traveling on the Shinkansen, Yokoi saw a bored businessman playing with an LCD calculator by pressing the buttons. Yokoi then got the idea for a watch that doubled as a miniature video gaming pastime, and went on to create Game & Watch, a line of handheld electronic games of simple LCD animated minigames, which ran from 1980 to 1991 and had 60 variations.