What J. B. Dunlop invented?

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What J. B. Dunlop invented?

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1) For whom high heeled shoes were invented?

2) This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel.

3) Who is the only U.S. President to invent and patent something?

4) Who invented the Spinning Jenny?

5) What did cardiologist Dr. Paul Zoll invent in Massachusetts in 1952?

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