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First of all many brands who previously were making radios started making TV's. This started in the late 40s. Also many television stations emerged. A lot of studios around the world are working exclusively for television programs.
The economy grew in the 1920's due to World War I. Many industries and businesses were created in the 1920's as a result of the war.
Mining, textiles, agriculture and timber industries grew due to the expanding railroads
automobile
grew rapidly as a result of new industries
automobile
automobile
automobile
automobile
Anyone that was in need of a device to contact easily
Meat packing
Pretty much everything they grew.