A patent was received for Ole Kirk Christiansen’s LEGO plastic bricks.
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Alexander Miles patented the automatic opening and closing elevator.
A polygraph test was conducted by its inventor, Leonarde Keeler, for the first time.
Samuel Colt patented the multi-shot revolving cylinder gun.
A patent was awarded to Willis Carrier, which gave us the world’s first Air Conditioner.
Barbed wire was patented by Lucien B Smith in Ohio, US.
