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Nancy Johnson invented hand-cranked ice cream churn in

  • A.1843
  • B.1846
  • C.1845
  • D.1841

Answer: A

It was 1843.

Nancy Johnson patented the hand-cranked ice cream churn, in which a paddle inside a cylinder was turned by hand while the cylinder sat in a bucket of ice and salt. The design is still the basis of domestic ice cream makers.

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