During the "Golden Age" of advertising,the introduction of which advertising medium helped make the advertising industry a focus of great attention?

Name: During the "Golden Age" of advertising,the introduction of which advertising medium helped make the advertising industry a focus of great attention?
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The Answer of During the "Golden Age" of advertising,the introduction of which advertising medium helped make the advertising industry a focus of great attention?

During the "Golden Age" of Advertising,the Introduction of Which Advertising