Thomas J Martin patented the fire extinguisher.
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German inventor Ferdinand von Zeppelin granted a patent for the navigable balloon.
The first movie projector, correctly named the kinetoscope, was patented by Thomas Edison.
A polygraph test was conducted by its inventor, Leonarde Keeler, for the first time.
The lie detector, invented in 1921 by John Augustus Larson, was first used in the Netherlands.
Robert Goddard was granted a patent for the rocket-powered aircraft.
