Inventor Alan Clark was granted his patent for the telescope.
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A polygraph test was conducted by its inventor, Leonarde Keeler, for the first time.
Inventor Otis Tufts patented the first elevator in the US.
Thomas Edison filed his patent for the Optical Phonograph.
Inventor Richard Rhodes received the patent for a hearing aid.
Inventor John Hyatt registered cellulose nitrate (celluloid) as a trademark.
