Campbell Ewald, circa 1934
Creative use of chalk.
As seen in Adweek, January 23, 2012
The first radio ads aired in 1922, and Campbell Ewald was hot on it's tail with chalk and chalkboard in hand, logging and tracking radio buys. We're still on the continual pursuit of innovation — just with a little less chalk.
Photo caption reads:
Campbell Ewald staffers handle radio buys in 1934. At the time, NBC owned Blue and Red Radio Networks; Columbia Broadcasting System later became the CBS Radio Network.