Whose ingenuity is primarily credited for inventing the pinwheel mechanism in the United States?

Answer

Frank Stephen Baldwin

Frank Stephen Baldwin is credited with inventing the pinwheel mechanism, formally known as the stepped drum calculator, specifically within the context of the United States. Although the concept of the stepped drum had historical theoretical foundations laid by Gottfried Wilhelm Leibniz centuries earlier, Baldwin was the inventor who successfully translated this theory into a practical, commercially viable machine, first conceived in 1875. His persistent work resulted in a machine that significantly impacted American office efficiency and laid the foundation for subsequent mechanical calculators that utilized this elegant, reliable pinwheel structure.

Whose ingenuity is primarily credited for inventing the pinwheel mechanism in the United States?
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