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.
Nathaniel Hawthorne Nathaniel Hawthorne ( ; born Nathaniel Hathorne; July 4, 1804 – May 19, 1864) was an American novelist, dark romantic, and short story writer.