Photo of Esther Ralston from the radio daytime drama Portia Faces Life.
Date
1941. en:Portia Faces Life began in 1940. The release says the show moved to NBC red on Monday, April 28. This was in 1941.
Radio programs often were switched between networks; the most common reason for this was a new show sponsor and the sponsor's preference for a given network. en:Amos 'n' Andy began on NBC in 1928 and was taken to CBS by the show's new sponsor, Campbell's Soups, who preferred dealing with CBS. Later, the program moved back to NBC and again to CBS where it remained until it went off the air in 1960.
NBC once had 2 radio networks, the Red and the Blue[1]. The Red Network carried the most popular radio shows while the Blue Network carried the lesser-known programs and sustaining, or non-sponsored shows. Amos 'n' Andy began airing on the Blue Network; When the radio program became very popular, it was moved from the Blue to the Red Network. Because of a successful antitrust suit, NBC was forced to divest itself of one of its radio networks in 1942. The company sold the Blue Network, which became ABC, keeping the Red Network, which was known thereafter as NBC since there was no longer a need to distinguish between the two.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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