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The Whistler is an American radio mystery drama which ran from May 16, 1942, until September 22, 1955, on the west-coast regional CBS radio network. The show was also broadcast in Chicago and over Armed Forces Radio. On the West Coast of the United States, it was sponsored by the Signal Oil Company: "That whistle is your signal for the Signal Oil program, The Whistler." There were also two short-lived attempts to form east-coast broadcast spurs: July 3 to September 25, 1946, sponsored by the Campbell Soup Company; and March 26, 1947, to September 29, 1948, sponsored by Household Finance. The program was also adapted into a film noir series by Columbia Pictures in 1944.

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