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John B. Stetson Company, Germantown & Columbia Avenues, Philadelphia, Philadelphia County, PA | Library of Congress
![Historical Society of Pennsylvania on X: "In 1869, the nation's first ad agency, N. W. Ayer & Son, opened in Phila. It pioneered many practices in use today such as utilizing open Historical Society of Pennsylvania on X: "In 1869, the nation's first ad agency, N. W. Ayer & Son, opened in Phila. It pioneered many practices in use today such as utilizing open](https://pbs.twimg.com/media/ErI-2jGXAAYkkZr.jpg:large)
Historical Society of Pennsylvania on X: "In 1869, the nation's first ad agency, N. W. Ayer & Son, opened in Phila. It pioneered many practices in use today such as utilizing open
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