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
Michael Nesmith in choral and drama activities during his years at Thomas Jefferson High School in Dallas. He also began to write verse poetry. When he was 15 he enrolled in the Dallas Theater Center teen program, where he was featured in several plays. Without graduating from high school, Nesmith enlisted in the United States Air Force in 1960. He completed basic training at Lackland Air Force Base in San Antonio, was trained as an aircraft mechanic at Sheppard Air Force Base in Wichita Falls, Texas, and then was permanently stationed at the Clinton-Sherman Air Force Base near Burns Flat, Oklahoma. While