It was the summer of 1952, and the executives of Tombow Pencil were about to revolutionize the Japanese pencil industry—or, possibly, fall flat on their faces. Hachiro Ogawa, the son of founder Harunosuke Ogawa, was Tombow's managing director, and he had just finished a years-long project, at enormous cost...

https://blog.tombowusa.com/2020/07/30/everything-you-need-to-know-about-tombow-pencils/