 American inventor Hammond had earlier developed a Teleview sequential viewing system for use as part of the successful productions of the "Ziegfeld Follies" (1907–1931).Its use influenced producer André Charlot, who was in the United States at the time of the "Follies", to attempt something similar in Europe.Because the patent did not have immediate effect in foreign countries, Hammond was unable to collect any royalties from the production of "London Calling!