Benjamin Franklin announced his invention of bifocal eyeglasses.
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Sylvanus Bowser's invention of the gasoline pump was delivered to a dealer in Fort Wayne, Indiana, US.
The pocket watch patent was awarded to Dutch mathematician and scientist Christiaan Huygens.
Johannes Ostermeier patented the flashbulb for cameras.
Inventor Richard Rhodes received the patent for a hearing aid.
Robert Watson-Watt demonstrated radar in Slough, England, UK.
