Shoals's wife works as a secretary in a company. At first, because my wife was busy with work, she often took home unfinished work and rushed to write materials overnight, which was very hard. Shoals loves his wife very much, so she has to help copy. Sometimes she writes late into the night, and both of them often have sore hands and arms. Thus, Shoals began to have the idea of inventing a writing machine. After six years of hard research, he built a typewriter like a sewing machine.