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Was October 23, 2026 patented?

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YES

Yes — US Patent 196,473 for Nicolaus Otto and the Crossleys' gas-motor engine was issued on 23 October 1877.

Why
  • Patent 196,473 issued October 23, 1877 to Otto and Crossley
  • It covered the four-stroke gas-motor engine cycle
  • The Smithsonian holds the brass patent model, no. MC.308695

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