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D.F. Duncan Sr

D.F. Duncan Sr. was the co-patent holder of a four-wheel hydraulic automobile brake, the marketer of the first successful parking meter, the genius behind the first premium incentive (e.g. send in two cereal boxtops and receive a toy rocket ship . . ."), and the man responsible for the first great yo-yo fad in the United States.

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The History of the Yo-Yo
D.F. Duncan Sr. created the first U.S yo-yo fad.

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