Tipp-Ex errors" (German: "Tippfehler"). He subsequently founded a company of the same name. Shortly after that a "Tipp-Ex Sales & Distribution" company (Tipp-Ex Vertrieb GmbH & Co. KG) was founded in Frankfurt by Otto Carls. This company still exists under the name of Tipp-Ex GmbH & Co. KG close to Frankfurt. "Tipp-Ex" became a registered trademark with the German patent office in 1987. Earlier, in 1951, Bette Nesmith Graham invented the first correction fluid in her kitchen and began marketing the product in 1956 as "Mistake Out", later called Liquid Paper. Tipp-Ex GmbH only started to produce white correction fluid in
Bette Nesmith Graham 1942). After Warren Nesmith returned home, they divorced (1946). Her father died in the early 1950s, leaving some property in Dallas to Bette. She, her mother, Michael, and her sister Yvonne moved there. To support herself as a single mother, she worked as a secretary at Texas Bank and Trust. She eventually attained the position of the executive secretary, the highest position open at that time to women in the industry. It was difficult to erase mistakes made by early electric typewriters, which caused problems. In order to make extra money she used her talent painting holiday windows at the