Wade-Dahl-Till valve was partially built by the novelist of what nationality?
Roald Dahl Roald Dahl ( , ] ; 13 September 1916 – 23 November 1990) was a British novelist, short story writer, poet, screenwriter, and fighter pilot. His books have sold more than 250 million copies worldwide.
Stefan Zweig Stefan Zweig ( ; ] ; November 28, 1881 – February 22, 1942) was an Austrian novelist, playwright, journalist and biographer. At the height of his literary career, in the 1920s and 1930s, he was one of the most popular writers in the world.